xfs: merge xfs_lrw.c into xfs_file.c
Currently the code to implement the file operations is split over two small files. Merge the content of xfs_lrw.c into xfs_file.c to have it in one place. Note that I haven't done various cleanups that are possible after this yet, they will follow in the next patch. Also the function xfs_dev_is_read_only which was in xfs_lrw.c before really doesn't fit in here at all and was moved to xfs_mount.c. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
Alex Elder
parent
b262e5dfd9
commit
dda35b8f84
@ -105,7 +105,6 @@ xfs-y += $(addprefix $(XFS_LINUX)/, \
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xfs_globals.o \
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xfs_ioctl.o \
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xfs_iops.o \
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xfs_lrw.o \
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xfs_super.o \
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xfs_sync.o \
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xfs_xattr.o)
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@ -16,6 +16,7 @@
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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@ -34,16 +35,738 @@
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#include "xfs_dir2_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_rw.h"
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#include "xfs_vnodeops.h"
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#include "xfs_da_btree.h"
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#include "xfs_ioctl.h"
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#include "xfs_trace.h"
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#include <linux/dcache.h>
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static const struct vm_operations_struct xfs_file_vm_ops;
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/*
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* xfs_iozero
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*
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* xfs_iozero clears the specified range of buffer supplied,
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* and marks all the affected blocks as valid and modified. If
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* an affected block is not allocated, it will be allocated. If
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* an affected block is not completely overwritten, and is not
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* valid before the operation, it will be read from disk before
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* being partially zeroed.
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*/
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STATIC int
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xfs_iozero(
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struct xfs_inode *ip, /* inode */
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loff_t pos, /* offset in file */
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size_t count) /* size of data to zero */
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{
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struct page *page;
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struct address_space *mapping;
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int status;
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mapping = VFS_I(ip)->i_mapping;
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do {
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unsigned offset, bytes;
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void *fsdata;
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offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
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bytes = PAGE_CACHE_SIZE - offset;
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if (bytes > count)
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bytes = count;
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status = pagecache_write_begin(NULL, mapping, pos, bytes,
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AOP_FLAG_UNINTERRUPTIBLE,
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&page, &fsdata);
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if (status)
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break;
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zero_user(page, offset, bytes);
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status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
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page, fsdata);
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WARN_ON(status <= 0); /* can't return less than zero! */
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pos += bytes;
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count -= bytes;
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status = 0;
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} while (count);
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return (-status);
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}
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ssize_t /* bytes read, or (-) error */
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xfs_read(
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xfs_inode_t *ip,
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struct kiocb *iocb,
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const struct iovec *iovp,
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unsigned int segs,
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loff_t *offset,
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int ioflags)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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xfs_mount_t *mp = ip->i_mount;
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size_t size = 0;
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ssize_t ret = 0;
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xfs_fsize_t n;
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unsigned long seg;
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XFS_STATS_INC(xs_read_calls);
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/* START copy & waste from filemap.c */
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for (seg = 0; seg < segs; seg++) {
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const struct iovec *iv = &iovp[seg];
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/*
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* If any segment has a negative length, or the cumulative
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* length ever wraps negative then return -EINVAL.
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*/
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size += iv->iov_len;
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if (unlikely((ssize_t)(size|iv->iov_len) < 0))
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return XFS_ERROR(-EINVAL);
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}
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/* END copy & waste from filemap.c */
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if (unlikely(ioflags & IO_ISDIRECT)) {
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xfs_buftarg_t *target =
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XFS_IS_REALTIME_INODE(ip) ?
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mp->m_rtdev_targp : mp->m_ddev_targp;
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if ((*offset & target->bt_smask) ||
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(size & target->bt_smask)) {
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if (*offset == ip->i_size) {
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return (0);
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}
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return -XFS_ERROR(EINVAL);
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}
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}
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n = XFS_MAXIOFFSET(mp) - *offset;
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if ((n <= 0) || (size == 0))
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return 0;
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if (n < size)
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size = n;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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if (unlikely(ioflags & IO_ISDIRECT))
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mutex_lock(&inode->i_mutex);
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xfs_ilock(ip, XFS_IOLOCK_SHARED);
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if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
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int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
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int iolock = XFS_IOLOCK_SHARED;
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ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
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dmflags, &iolock);
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if (ret) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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if (unlikely(ioflags & IO_ISDIRECT))
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mutex_unlock(&inode->i_mutex);
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return ret;
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}
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}
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if (unlikely(ioflags & IO_ISDIRECT)) {
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if (inode->i_mapping->nrpages)
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ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
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-1, FI_REMAPF_LOCKED);
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mutex_unlock(&inode->i_mutex);
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if (ret) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return ret;
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}
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}
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trace_xfs_file_read(ip, size, *offset, ioflags);
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iocb->ki_pos = *offset;
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ret = generic_file_aio_read(iocb, iovp, segs, *offset);
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if (ret > 0)
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XFS_STATS_ADD(xs_read_bytes, ret);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return ret;
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}
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ssize_t
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xfs_splice_read(
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xfs_inode_t *ip,
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struct file *infilp,
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loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t count,
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int flags,
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int ioflags)
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{
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xfs_mount_t *mp = ip->i_mount;
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ssize_t ret;
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XFS_STATS_INC(xs_read_calls);
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return -EIO;
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xfs_ilock(ip, XFS_IOLOCK_SHARED);
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if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
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int iolock = XFS_IOLOCK_SHARED;
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int error;
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error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
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FILP_DELAY_FLAG(infilp), &iolock);
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if (error) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return -error;
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}
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}
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trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
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ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
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if (ret > 0)
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XFS_STATS_ADD(xs_read_bytes, ret);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return ret;
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}
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ssize_t
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xfs_splice_write(
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xfs_inode_t *ip,
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struct pipe_inode_info *pipe,
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struct file *outfilp,
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loff_t *ppos,
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size_t count,
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int flags,
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int ioflags)
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{
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xfs_mount_t *mp = ip->i_mount;
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ssize_t ret;
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struct inode *inode = outfilp->f_mapping->host;
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xfs_fsize_t isize, new_size;
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XFS_STATS_INC(xs_write_calls);
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return -EIO;
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
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int iolock = XFS_IOLOCK_EXCL;
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int error;
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error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
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FILP_DELAY_FLAG(outfilp), &iolock);
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if (error) {
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return -error;
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}
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}
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new_size = *ppos + count;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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if (new_size > ip->i_size)
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ip->i_new_size = new_size;
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
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ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
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if (ret > 0)
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XFS_STATS_ADD(xs_write_bytes, ret);
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isize = i_size_read(inode);
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if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
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*ppos = isize;
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if (*ppos > ip->i_size) {
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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if (*ppos > ip->i_size)
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ip->i_size = *ppos;
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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if (ip->i_new_size) {
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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ip->i_new_size = 0;
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if (ip->i_d.di_size > ip->i_size)
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ip->i_d.di_size = ip->i_size;
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return ret;
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}
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/*
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* This routine is called to handle zeroing any space in the last
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* block of the file that is beyond the EOF. We do this since the
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* size is being increased without writing anything to that block
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* and we don't want anyone to read the garbage on the disk.
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*/
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STATIC int /* error (positive) */
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xfs_zero_last_block(
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xfs_inode_t *ip,
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xfs_fsize_t offset,
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xfs_fsize_t isize)
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{
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xfs_fileoff_t last_fsb;
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xfs_mount_t *mp = ip->i_mount;
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int nimaps;
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int zero_offset;
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int zero_len;
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int error = 0;
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xfs_bmbt_irec_t imap;
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
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zero_offset = XFS_B_FSB_OFFSET(mp, isize);
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if (zero_offset == 0) {
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/*
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* There are no extra bytes in the last block on disk to
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* zero, so return.
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*/
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return 0;
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}
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last_fsb = XFS_B_TO_FSBT(mp, isize);
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nimaps = 1;
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error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
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&nimaps, NULL, NULL);
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if (error) {
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return error;
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}
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ASSERT(nimaps > 0);
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/*
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* If the block underlying isize is just a hole, then there
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* is nothing to zero.
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*/
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if (imap.br_startblock == HOLESTARTBLOCK) {
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return 0;
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}
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/*
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* Zero the part of the last block beyond the EOF, and write it
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* out sync. We need to drop the ilock while we do this so we
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* don't deadlock when the buffer cache calls back to us.
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*/
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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zero_len = mp->m_sb.sb_blocksize - zero_offset;
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if (isize + zero_len > offset)
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zero_len = offset - isize;
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error = xfs_iozero(ip, isize, zero_len);
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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ASSERT(error >= 0);
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return error;
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}
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/*
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* Zero any on disk space between the current EOF and the new,
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* larger EOF. This handles the normal case of zeroing the remainder
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* of the last block in the file and the unusual case of zeroing blocks
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* out beyond the size of the file. This second case only happens
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* with fixed size extents and when the system crashes before the inode
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* size was updated but after blocks were allocated. If fill is set,
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* then any holes in the range are filled and zeroed. If not, the holes
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* are left alone as holes.
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*/
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int /* error (positive) */
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xfs_zero_eof(
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xfs_inode_t *ip,
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xfs_off_t offset, /* starting I/O offset */
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xfs_fsize_t isize) /* current inode size */
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{
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xfs_mount_t *mp = ip->i_mount;
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xfs_fileoff_t start_zero_fsb;
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xfs_fileoff_t end_zero_fsb;
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xfs_fileoff_t zero_count_fsb;
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xfs_fileoff_t last_fsb;
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xfs_fileoff_t zero_off;
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xfs_fsize_t zero_len;
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int nimaps;
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int error = 0;
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xfs_bmbt_irec_t imap;
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
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ASSERT(offset > isize);
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/*
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* First handle zeroing the block on which isize resides.
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* We only zero a part of that block so it is handled specially.
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*/
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error = xfs_zero_last_block(ip, offset, isize);
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if (error) {
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
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return error;
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}
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/*
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* Calculate the range between the new size and the old
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* where blocks needing to be zeroed may exist. To get the
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* block where the last byte in the file currently resides,
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* we need to subtract one from the size and truncate back
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* to a block boundary. We subtract 1 in case the size is
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* exactly on a block boundary.
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*/
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last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
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start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
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end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
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ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
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if (last_fsb == end_zero_fsb) {
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/*
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* The size was only incremented on its last block.
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* We took care of that above, so just return.
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*/
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return 0;
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}
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ASSERT(start_zero_fsb <= end_zero_fsb);
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while (start_zero_fsb <= end_zero_fsb) {
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nimaps = 1;
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zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
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error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
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0, NULL, 0, &imap, &nimaps, NULL, NULL);
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if (error) {
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
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return error;
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}
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ASSERT(nimaps > 0);
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if (imap.br_state == XFS_EXT_UNWRITTEN ||
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imap.br_startblock == HOLESTARTBLOCK) {
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/*
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* This loop handles initializing pages that were
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* partially initialized by the code below this
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* loop. It basically zeroes the part of the page
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* that sits on a hole and sets the page as P_HOLE
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* and calls remapf if it is a mapped file.
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*/
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start_zero_fsb = imap.br_startoff + imap.br_blockcount;
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ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
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continue;
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}
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/*
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* There are blocks we need to zero.
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* Drop the inode lock while we're doing the I/O.
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* We'll still have the iolock to protect us.
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*/
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
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zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
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if ((zero_off + zero_len) > offset)
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zero_len = offset - zero_off;
|
||||
|
||||
error = xfs_iozero(ip, zero_off, zero_len);
|
||||
if (error) {
|
||||
goto out_lock;
|
||||
}
|
||||
|
||||
start_zero_fsb = imap.br_startoff + imap.br_blockcount;
|
||||
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_lock:
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
ASSERT(error >= 0);
|
||||
return error;
|
||||
}
|
||||
|
||||
ssize_t /* bytes written, or (-) error */
|
||||
xfs_write(
|
||||
struct xfs_inode *xip,
|
||||
struct kiocb *iocb,
|
||||
const struct iovec *iovp,
|
||||
unsigned int nsegs,
|
||||
loff_t *offset,
|
||||
int ioflags)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
struct address_space *mapping = file->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
unsigned long segs = nsegs;
|
||||
xfs_mount_t *mp;
|
||||
ssize_t ret = 0, error = 0;
|
||||
xfs_fsize_t isize, new_size;
|
||||
int iolock;
|
||||
int eventsent = 0;
|
||||
size_t ocount = 0, count;
|
||||
loff_t pos;
|
||||
int need_i_mutex;
|
||||
|
||||
XFS_STATS_INC(xs_write_calls);
|
||||
|
||||
error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
count = ocount;
|
||||
pos = *offset;
|
||||
|
||||
if (count == 0)
|
||||
return 0;
|
||||
|
||||
mp = xip->i_mount;
|
||||
|
||||
xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
|
||||
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
return -EIO;
|
||||
|
||||
relock:
|
||||
if (ioflags & IO_ISDIRECT) {
|
||||
iolock = XFS_IOLOCK_SHARED;
|
||||
need_i_mutex = 0;
|
||||
} else {
|
||||
iolock = XFS_IOLOCK_EXCL;
|
||||
need_i_mutex = 1;
|
||||
mutex_lock(&inode->i_mutex);
|
||||
}
|
||||
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
|
||||
start:
|
||||
error = -generic_write_checks(file, &pos, &count,
|
||||
S_ISBLK(inode->i_mode));
|
||||
if (error) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
goto out_unlock_mutex;
|
||||
}
|
||||
|
||||
if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
|
||||
!(ioflags & IO_INVIS) && !eventsent)) {
|
||||
int dmflags = FILP_DELAY_FLAG(file);
|
||||
|
||||
if (need_i_mutex)
|
||||
dmflags |= DM_FLAGS_IMUX;
|
||||
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
|
||||
pos, count, dmflags, &iolock);
|
||||
if (error) {
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
eventsent = 1;
|
||||
|
||||
/*
|
||||
* The iolock was dropped and reacquired in XFS_SEND_DATA
|
||||
* so we have to recheck the size when appending.
|
||||
* We will only "goto start;" once, since having sent the
|
||||
* event prevents another call to XFS_SEND_DATA, which is
|
||||
* what allows the size to change in the first place.
|
||||
*/
|
||||
if ((file->f_flags & O_APPEND) && pos != xip->i_size)
|
||||
goto start;
|
||||
}
|
||||
|
||||
if (ioflags & IO_ISDIRECT) {
|
||||
xfs_buftarg_t *target =
|
||||
XFS_IS_REALTIME_INODE(xip) ?
|
||||
mp->m_rtdev_targp : mp->m_ddev_targp;
|
||||
|
||||
if ((pos & target->bt_smask) || (count & target->bt_smask)) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
return XFS_ERROR(-EINVAL);
|
||||
}
|
||||
|
||||
if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
iolock = XFS_IOLOCK_EXCL;
|
||||
need_i_mutex = 1;
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
goto start;
|
||||
}
|
||||
}
|
||||
|
||||
new_size = pos + count;
|
||||
if (new_size > xip->i_size)
|
||||
xip->i_new_size = new_size;
|
||||
|
||||
if (likely(!(ioflags & IO_INVIS)))
|
||||
file_update_time(file);
|
||||
|
||||
/*
|
||||
* If the offset is beyond the size of the file, we have a couple
|
||||
* of things to do. First, if there is already space allocated
|
||||
* we need to either create holes or zero the disk or ...
|
||||
*
|
||||
* If there is a page where the previous size lands, we need
|
||||
* to zero it out up to the new size.
|
||||
*/
|
||||
|
||||
if (pos > xip->i_size) {
|
||||
error = xfs_zero_eof(xip, pos, xip->i_size);
|
||||
if (error) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
}
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
|
||||
/*
|
||||
* If we're writing the file then make sure to clear the
|
||||
* setuid and setgid bits if the process is not being run
|
||||
* by root. This keeps people from modifying setuid and
|
||||
* setgid binaries.
|
||||
*/
|
||||
error = -file_remove_suid(file);
|
||||
if (unlikely(error))
|
||||
goto out_unlock_internal;
|
||||
|
||||
/* We can write back this queue in page reclaim */
|
||||
current->backing_dev_info = mapping->backing_dev_info;
|
||||
|
||||
if ((ioflags & IO_ISDIRECT)) {
|
||||
if (mapping->nrpages) {
|
||||
WARN_ON(need_i_mutex == 0);
|
||||
error = xfs_flushinval_pages(xip,
|
||||
(pos & PAGE_CACHE_MASK),
|
||||
-1, FI_REMAPF_LOCKED);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
|
||||
if (need_i_mutex) {
|
||||
/* demote the lock now the cached pages are gone */
|
||||
xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
iolock = XFS_IOLOCK_SHARED;
|
||||
need_i_mutex = 0;
|
||||
}
|
||||
|
||||
trace_xfs_file_direct_write(xip, count, *offset, ioflags);
|
||||
ret = generic_file_direct_write(iocb, iovp,
|
||||
&segs, pos, offset, count, ocount);
|
||||
|
||||
/*
|
||||
* direct-io write to a hole: fall through to buffered I/O
|
||||
* for completing the rest of the request.
|
||||
*/
|
||||
if (ret >= 0 && ret != count) {
|
||||
XFS_STATS_ADD(xs_write_bytes, ret);
|
||||
|
||||
pos += ret;
|
||||
count -= ret;
|
||||
|
||||
ioflags &= ~IO_ISDIRECT;
|
||||
xfs_iunlock(xip, iolock);
|
||||
goto relock;
|
||||
}
|
||||
} else {
|
||||
int enospc = 0;
|
||||
ssize_t ret2 = 0;
|
||||
|
||||
write_retry:
|
||||
trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
|
||||
ret2 = generic_file_buffered_write(iocb, iovp, segs,
|
||||
pos, offset, count, ret);
|
||||
/*
|
||||
* if we just got an ENOSPC, flush the inode now we
|
||||
* aren't holding any page locks and retry *once*
|
||||
*/
|
||||
if (ret2 == -ENOSPC && !enospc) {
|
||||
error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
enospc = 1;
|
||||
goto write_retry;
|
||||
}
|
||||
ret = ret2;
|
||||
}
|
||||
|
||||
current->backing_dev_info = NULL;
|
||||
|
||||
isize = i_size_read(inode);
|
||||
if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
|
||||
*offset = isize;
|
||||
|
||||
if (*offset > xip->i_size) {
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
if (*offset > xip->i_size)
|
||||
xip->i_size = *offset;
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
|
||||
if (ret == -ENOSPC &&
|
||||
DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
|
||||
xfs_iunlock(xip, iolock);
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
|
||||
DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
|
||||
0, 0, 0); /* Delay flag intentionally unused */
|
||||
if (need_i_mutex)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, iolock);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
goto start;
|
||||
}
|
||||
|
||||
error = -ret;
|
||||
if (ret <= 0)
|
||||
goto out_unlock_internal;
|
||||
|
||||
XFS_STATS_ADD(xs_write_bytes, ret);
|
||||
|
||||
/* Handle various SYNC-type writes */
|
||||
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
|
||||
loff_t end = pos + ret - 1;
|
||||
int error2;
|
||||
|
||||
xfs_iunlock(xip, iolock);
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
error2 = filemap_write_and_wait_range(mapping, pos, end);
|
||||
if (!error)
|
||||
error = error2;
|
||||
if (need_i_mutex)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, iolock);
|
||||
|
||||
error2 = xfs_fsync(xip);
|
||||
if (!error)
|
||||
error = error2;
|
||||
}
|
||||
|
||||
out_unlock_internal:
|
||||
if (xip->i_new_size) {
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
xip->i_new_size = 0;
|
||||
/*
|
||||
* If this was a direct or synchronous I/O that failed (such
|
||||
* as ENOSPC) then part of the I/O may have been written to
|
||||
* disk before the error occured. In this case the on-disk
|
||||
* file size may have been adjusted beyond the in-memory file
|
||||
* size and now needs to be truncated back.
|
||||
*/
|
||||
if (xip->i_d.di_size > xip->i_size)
|
||||
xip->i_d.di_size = xip->i_size;
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
xfs_iunlock(xip, iolock);
|
||||
out_unlock_mutex:
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return -error;
|
||||
}
|
||||
|
||||
STATIC ssize_t
|
||||
xfs_file_aio_read(
|
||||
struct kiocb *iocb,
|
||||
|
||||
@ -1,796 +0,0 @@
|
||||
/*
|
||||
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it would be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write the Free Software Foundation,
|
||||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
#include "xfs.h"
|
||||
#include "xfs_fs.h"
|
||||
#include "xfs_bit.h"
|
||||
#include "xfs_log.h"
|
||||
#include "xfs_inum.h"
|
||||
#include "xfs_trans.h"
|
||||
#include "xfs_sb.h"
|
||||
#include "xfs_ag.h"
|
||||
#include "xfs_dir2.h"
|
||||
#include "xfs_alloc.h"
|
||||
#include "xfs_dmapi.h"
|
||||
#include "xfs_quota.h"
|
||||
#include "xfs_mount.h"
|
||||
#include "xfs_bmap_btree.h"
|
||||
#include "xfs_alloc_btree.h"
|
||||
#include "xfs_ialloc_btree.h"
|
||||
#include "xfs_dir2_sf.h"
|
||||
#include "xfs_attr_sf.h"
|
||||
#include "xfs_dinode.h"
|
||||
#include "xfs_inode.h"
|
||||
#include "xfs_bmap.h"
|
||||
#include "xfs_btree.h"
|
||||
#include "xfs_ialloc.h"
|
||||
#include "xfs_rtalloc.h"
|
||||
#include "xfs_error.h"
|
||||
#include "xfs_itable.h"
|
||||
#include "xfs_rw.h"
|
||||
#include "xfs_attr.h"
|
||||
#include "xfs_inode_item.h"
|
||||
#include "xfs_buf_item.h"
|
||||
#include "xfs_utils.h"
|
||||
#include "xfs_iomap.h"
|
||||
#include "xfs_vnodeops.h"
|
||||
#include "xfs_trace.h"
|
||||
|
||||
#include <linux/capability.h>
|
||||
#include <linux/writeback.h>
|
||||
|
||||
|
||||
/*
|
||||
* xfs_iozero
|
||||
*
|
||||
* xfs_iozero clears the specified range of buffer supplied,
|
||||
* and marks all the affected blocks as valid and modified. If
|
||||
* an affected block is not allocated, it will be allocated. If
|
||||
* an affected block is not completely overwritten, and is not
|
||||
* valid before the operation, it will be read from disk before
|
||||
* being partially zeroed.
|
||||
*/
|
||||
STATIC int
|
||||
xfs_iozero(
|
||||
struct xfs_inode *ip, /* inode */
|
||||
loff_t pos, /* offset in file */
|
||||
size_t count) /* size of data to zero */
|
||||
{
|
||||
struct page *page;
|
||||
struct address_space *mapping;
|
||||
int status;
|
||||
|
||||
mapping = VFS_I(ip)->i_mapping;
|
||||
do {
|
||||
unsigned offset, bytes;
|
||||
void *fsdata;
|
||||
|
||||
offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
|
||||
bytes = PAGE_CACHE_SIZE - offset;
|
||||
if (bytes > count)
|
||||
bytes = count;
|
||||
|
||||
status = pagecache_write_begin(NULL, mapping, pos, bytes,
|
||||
AOP_FLAG_UNINTERRUPTIBLE,
|
||||
&page, &fsdata);
|
||||
if (status)
|
||||
break;
|
||||
|
||||
zero_user(page, offset, bytes);
|
||||
|
||||
status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
|
||||
page, fsdata);
|
||||
WARN_ON(status <= 0); /* can't return less than zero! */
|
||||
pos += bytes;
|
||||
count -= bytes;
|
||||
status = 0;
|
||||
} while (count);
|
||||
|
||||
return (-status);
|
||||
}
|
||||
|
||||
ssize_t /* bytes read, or (-) error */
|
||||
xfs_read(
|
||||
xfs_inode_t *ip,
|
||||
struct kiocb *iocb,
|
||||
const struct iovec *iovp,
|
||||
unsigned int segs,
|
||||
loff_t *offset,
|
||||
int ioflags)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
struct inode *inode = file->f_mapping->host;
|
||||
xfs_mount_t *mp = ip->i_mount;
|
||||
size_t size = 0;
|
||||
ssize_t ret = 0;
|
||||
xfs_fsize_t n;
|
||||
unsigned long seg;
|
||||
|
||||
|
||||
XFS_STATS_INC(xs_read_calls);
|
||||
|
||||
/* START copy & waste from filemap.c */
|
||||
for (seg = 0; seg < segs; seg++) {
|
||||
const struct iovec *iv = &iovp[seg];
|
||||
|
||||
/*
|
||||
* If any segment has a negative length, or the cumulative
|
||||
* length ever wraps negative then return -EINVAL.
|
||||
*/
|
||||
size += iv->iov_len;
|
||||
if (unlikely((ssize_t)(size|iv->iov_len) < 0))
|
||||
return XFS_ERROR(-EINVAL);
|
||||
}
|
||||
/* END copy & waste from filemap.c */
|
||||
|
||||
if (unlikely(ioflags & IO_ISDIRECT)) {
|
||||
xfs_buftarg_t *target =
|
||||
XFS_IS_REALTIME_INODE(ip) ?
|
||||
mp->m_rtdev_targp : mp->m_ddev_targp;
|
||||
if ((*offset & target->bt_smask) ||
|
||||
(size & target->bt_smask)) {
|
||||
if (*offset == ip->i_size) {
|
||||
return (0);
|
||||
}
|
||||
return -XFS_ERROR(EINVAL);
|
||||
}
|
||||
}
|
||||
|
||||
n = XFS_MAXIOFFSET(mp) - *offset;
|
||||
if ((n <= 0) || (size == 0))
|
||||
return 0;
|
||||
|
||||
if (n < size)
|
||||
size = n;
|
||||
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
return -EIO;
|
||||
|
||||
if (unlikely(ioflags & IO_ISDIRECT))
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(ip, XFS_IOLOCK_SHARED);
|
||||
|
||||
if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
|
||||
int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
|
||||
int iolock = XFS_IOLOCK_SHARED;
|
||||
|
||||
ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
|
||||
dmflags, &iolock);
|
||||
if (ret) {
|
||||
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
||||
if (unlikely(ioflags & IO_ISDIRECT))
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
if (unlikely(ioflags & IO_ISDIRECT)) {
|
||||
if (inode->i_mapping->nrpages)
|
||||
ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
|
||||
-1, FI_REMAPF_LOCKED);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
if (ret) {
|
||||
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
trace_xfs_file_read(ip, size, *offset, ioflags);
|
||||
|
||||
iocb->ki_pos = *offset;
|
||||
ret = generic_file_aio_read(iocb, iovp, segs, *offset);
|
||||
if (ret > 0)
|
||||
XFS_STATS_ADD(xs_read_bytes, ret);
|
||||
|
||||
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t
|
||||
xfs_splice_read(
|
||||
xfs_inode_t *ip,
|
||||
struct file *infilp,
|
||||
loff_t *ppos,
|
||||
struct pipe_inode_info *pipe,
|
||||
size_t count,
|
||||
int flags,
|
||||
int ioflags)
|
||||
{
|
||||
xfs_mount_t *mp = ip->i_mount;
|
||||
ssize_t ret;
|
||||
|
||||
XFS_STATS_INC(xs_read_calls);
|
||||
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
|
||||
return -EIO;
|
||||
|
||||
xfs_ilock(ip, XFS_IOLOCK_SHARED);
|
||||
|
||||
if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
|
||||
int iolock = XFS_IOLOCK_SHARED;
|
||||
int error;
|
||||
|
||||
error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
|
||||
FILP_DELAY_FLAG(infilp), &iolock);
|
||||
if (error) {
|
||||
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
||||
return -error;
|
||||
}
|
||||
}
|
||||
|
||||
trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
|
||||
|
||||
ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
|
||||
if (ret > 0)
|
||||
XFS_STATS_ADD(xs_read_bytes, ret);
|
||||
|
||||
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t
|
||||
xfs_splice_write(
|
||||
xfs_inode_t *ip,
|
||||
struct pipe_inode_info *pipe,
|
||||
struct file *outfilp,
|
||||
loff_t *ppos,
|
||||
size_t count,
|
||||
int flags,
|
||||
int ioflags)
|
||||
{
|
||||
xfs_mount_t *mp = ip->i_mount;
|
||||
ssize_t ret;
|
||||
struct inode *inode = outfilp->f_mapping->host;
|
||||
xfs_fsize_t isize, new_size;
|
||||
|
||||
XFS_STATS_INC(xs_write_calls);
|
||||
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
|
||||
return -EIO;
|
||||
|
||||
xfs_ilock(ip, XFS_IOLOCK_EXCL);
|
||||
|
||||
if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
|
||||
int iolock = XFS_IOLOCK_EXCL;
|
||||
int error;
|
||||
|
||||
error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
|
||||
FILP_DELAY_FLAG(outfilp), &iolock);
|
||||
if (error) {
|
||||
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
||||
return -error;
|
||||
}
|
||||
}
|
||||
|
||||
new_size = *ppos + count;
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
if (new_size > ip->i_size)
|
||||
ip->i_new_size = new_size;
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
|
||||
|
||||
ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
|
||||
if (ret > 0)
|
||||
XFS_STATS_ADD(xs_write_bytes, ret);
|
||||
|
||||
isize = i_size_read(inode);
|
||||
if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
|
||||
*ppos = isize;
|
||||
|
||||
if (*ppos > ip->i_size) {
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
if (*ppos > ip->i_size)
|
||||
ip->i_size = *ppos;
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
|
||||
if (ip->i_new_size) {
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
ip->i_new_size = 0;
|
||||
if (ip->i_d.di_size > ip->i_size)
|
||||
ip->i_d.di_size = ip->i_size;
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* This routine is called to handle zeroing any space in the last
|
||||
* block of the file that is beyond the EOF. We do this since the
|
||||
* size is being increased without writing anything to that block
|
||||
* and we don't want anyone to read the garbage on the disk.
|
||||
*/
|
||||
STATIC int /* error (positive) */
|
||||
xfs_zero_last_block(
|
||||
xfs_inode_t *ip,
|
||||
xfs_fsize_t offset,
|
||||
xfs_fsize_t isize)
|
||||
{
|
||||
xfs_fileoff_t last_fsb;
|
||||
xfs_mount_t *mp = ip->i_mount;
|
||||
int nimaps;
|
||||
int zero_offset;
|
||||
int zero_len;
|
||||
int error = 0;
|
||||
xfs_bmbt_irec_t imap;
|
||||
|
||||
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
||||
|
||||
zero_offset = XFS_B_FSB_OFFSET(mp, isize);
|
||||
if (zero_offset == 0) {
|
||||
/*
|
||||
* There are no extra bytes in the last block on disk to
|
||||
* zero, so return.
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
last_fsb = XFS_B_TO_FSBT(mp, isize);
|
||||
nimaps = 1;
|
||||
error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
|
||||
&nimaps, NULL, NULL);
|
||||
if (error) {
|
||||
return error;
|
||||
}
|
||||
ASSERT(nimaps > 0);
|
||||
/*
|
||||
* If the block underlying isize is just a hole, then there
|
||||
* is nothing to zero.
|
||||
*/
|
||||
if (imap.br_startblock == HOLESTARTBLOCK) {
|
||||
return 0;
|
||||
}
|
||||
/*
|
||||
* Zero the part of the last block beyond the EOF, and write it
|
||||
* out sync. We need to drop the ilock while we do this so we
|
||||
* don't deadlock when the buffer cache calls back to us.
|
||||
*/
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
zero_len = mp->m_sb.sb_blocksize - zero_offset;
|
||||
if (isize + zero_len > offset)
|
||||
zero_len = offset - isize;
|
||||
error = xfs_iozero(ip, isize, zero_len);
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
ASSERT(error >= 0);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Zero any on disk space between the current EOF and the new,
|
||||
* larger EOF. This handles the normal case of zeroing the remainder
|
||||
* of the last block in the file and the unusual case of zeroing blocks
|
||||
* out beyond the size of the file. This second case only happens
|
||||
* with fixed size extents and when the system crashes before the inode
|
||||
* size was updated but after blocks were allocated. If fill is set,
|
||||
* then any holes in the range are filled and zeroed. If not, the holes
|
||||
* are left alone as holes.
|
||||
*/
|
||||
|
||||
int /* error (positive) */
|
||||
xfs_zero_eof(
|
||||
xfs_inode_t *ip,
|
||||
xfs_off_t offset, /* starting I/O offset */
|
||||
xfs_fsize_t isize) /* current inode size */
|
||||
{
|
||||
xfs_mount_t *mp = ip->i_mount;
|
||||
xfs_fileoff_t start_zero_fsb;
|
||||
xfs_fileoff_t end_zero_fsb;
|
||||
xfs_fileoff_t zero_count_fsb;
|
||||
xfs_fileoff_t last_fsb;
|
||||
xfs_fileoff_t zero_off;
|
||||
xfs_fsize_t zero_len;
|
||||
int nimaps;
|
||||
int error = 0;
|
||||
xfs_bmbt_irec_t imap;
|
||||
|
||||
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
|
||||
ASSERT(offset > isize);
|
||||
|
||||
/*
|
||||
* First handle zeroing the block on which isize resides.
|
||||
* We only zero a part of that block so it is handled specially.
|
||||
*/
|
||||
error = xfs_zero_last_block(ip, offset, isize);
|
||||
if (error) {
|
||||
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Calculate the range between the new size and the old
|
||||
* where blocks needing to be zeroed may exist. To get the
|
||||
* block where the last byte in the file currently resides,
|
||||
* we need to subtract one from the size and truncate back
|
||||
* to a block boundary. We subtract 1 in case the size is
|
||||
* exactly on a block boundary.
|
||||
*/
|
||||
last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
|
||||
start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
|
||||
end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
|
||||
ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
|
||||
if (last_fsb == end_zero_fsb) {
|
||||
/*
|
||||
* The size was only incremented on its last block.
|
||||
* We took care of that above, so just return.
|
||||
*/
|
||||
return 0;
|
||||
}
|
||||
|
||||
ASSERT(start_zero_fsb <= end_zero_fsb);
|
||||
while (start_zero_fsb <= end_zero_fsb) {
|
||||
nimaps = 1;
|
||||
zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
|
||||
error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
|
||||
0, NULL, 0, &imap, &nimaps, NULL, NULL);
|
||||
if (error) {
|
||||
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
|
||||
return error;
|
||||
}
|
||||
ASSERT(nimaps > 0);
|
||||
|
||||
if (imap.br_state == XFS_EXT_UNWRITTEN ||
|
||||
imap.br_startblock == HOLESTARTBLOCK) {
|
||||
/*
|
||||
* This loop handles initializing pages that were
|
||||
* partially initialized by the code below this
|
||||
* loop. It basically zeroes the part of the page
|
||||
* that sits on a hole and sets the page as P_HOLE
|
||||
* and calls remapf if it is a mapped file.
|
||||
*/
|
||||
start_zero_fsb = imap.br_startoff + imap.br_blockcount;
|
||||
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
|
||||
continue;
|
||||
}
|
||||
|
||||
/*
|
||||
* There are blocks we need to zero.
|
||||
* Drop the inode lock while we're doing the I/O.
|
||||
* We'll still have the iolock to protect us.
|
||||
*/
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
|
||||
zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
|
||||
|
||||
if ((zero_off + zero_len) > offset)
|
||||
zero_len = offset - zero_off;
|
||||
|
||||
error = xfs_iozero(ip, zero_off, zero_len);
|
||||
if (error) {
|
||||
goto out_lock;
|
||||
}
|
||||
|
||||
start_zero_fsb = imap.br_startoff + imap.br_blockcount;
|
||||
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
|
||||
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_lock:
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
ASSERT(error >= 0);
|
||||
return error;
|
||||
}
|
||||
|
||||
ssize_t /* bytes written, or (-) error */
|
||||
xfs_write(
|
||||
struct xfs_inode *xip,
|
||||
struct kiocb *iocb,
|
||||
const struct iovec *iovp,
|
||||
unsigned int nsegs,
|
||||
loff_t *offset,
|
||||
int ioflags)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
struct address_space *mapping = file->f_mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
unsigned long segs = nsegs;
|
||||
xfs_mount_t *mp;
|
||||
ssize_t ret = 0, error = 0;
|
||||
xfs_fsize_t isize, new_size;
|
||||
int iolock;
|
||||
int eventsent = 0;
|
||||
size_t ocount = 0, count;
|
||||
loff_t pos;
|
||||
int need_i_mutex;
|
||||
|
||||
XFS_STATS_INC(xs_write_calls);
|
||||
|
||||
error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
count = ocount;
|
||||
pos = *offset;
|
||||
|
||||
if (count == 0)
|
||||
return 0;
|
||||
|
||||
mp = xip->i_mount;
|
||||
|
||||
xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
|
||||
|
||||
if (XFS_FORCED_SHUTDOWN(mp))
|
||||
return -EIO;
|
||||
|
||||
relock:
|
||||
if (ioflags & IO_ISDIRECT) {
|
||||
iolock = XFS_IOLOCK_SHARED;
|
||||
need_i_mutex = 0;
|
||||
} else {
|
||||
iolock = XFS_IOLOCK_EXCL;
|
||||
need_i_mutex = 1;
|
||||
mutex_lock(&inode->i_mutex);
|
||||
}
|
||||
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
|
||||
start:
|
||||
error = -generic_write_checks(file, &pos, &count,
|
||||
S_ISBLK(inode->i_mode));
|
||||
if (error) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
goto out_unlock_mutex;
|
||||
}
|
||||
|
||||
if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
|
||||
!(ioflags & IO_INVIS) && !eventsent)) {
|
||||
int dmflags = FILP_DELAY_FLAG(file);
|
||||
|
||||
if (need_i_mutex)
|
||||
dmflags |= DM_FLAGS_IMUX;
|
||||
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
|
||||
pos, count, dmflags, &iolock);
|
||||
if (error) {
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
eventsent = 1;
|
||||
|
||||
/*
|
||||
* The iolock was dropped and reacquired in XFS_SEND_DATA
|
||||
* so we have to recheck the size when appending.
|
||||
* We will only "goto start;" once, since having sent the
|
||||
* event prevents another call to XFS_SEND_DATA, which is
|
||||
* what allows the size to change in the first place.
|
||||
*/
|
||||
if ((file->f_flags & O_APPEND) && pos != xip->i_size)
|
||||
goto start;
|
||||
}
|
||||
|
||||
if (ioflags & IO_ISDIRECT) {
|
||||
xfs_buftarg_t *target =
|
||||
XFS_IS_REALTIME_INODE(xip) ?
|
||||
mp->m_rtdev_targp : mp->m_ddev_targp;
|
||||
|
||||
if ((pos & target->bt_smask) || (count & target->bt_smask)) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
return XFS_ERROR(-EINVAL);
|
||||
}
|
||||
|
||||
if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
iolock = XFS_IOLOCK_EXCL;
|
||||
need_i_mutex = 1;
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
|
||||
goto start;
|
||||
}
|
||||
}
|
||||
|
||||
new_size = pos + count;
|
||||
if (new_size > xip->i_size)
|
||||
xip->i_new_size = new_size;
|
||||
|
||||
if (likely(!(ioflags & IO_INVIS)))
|
||||
file_update_time(file);
|
||||
|
||||
/*
|
||||
* If the offset is beyond the size of the file, we have a couple
|
||||
* of things to do. First, if there is already space allocated
|
||||
* we need to either create holes or zero the disk or ...
|
||||
*
|
||||
* If there is a page where the previous size lands, we need
|
||||
* to zero it out up to the new size.
|
||||
*/
|
||||
|
||||
if (pos > xip->i_size) {
|
||||
error = xfs_zero_eof(xip, pos, xip->i_size);
|
||||
if (error) {
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
}
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
|
||||
/*
|
||||
* If we're writing the file then make sure to clear the
|
||||
* setuid and setgid bits if the process is not being run
|
||||
* by root. This keeps people from modifying setuid and
|
||||
* setgid binaries.
|
||||
*/
|
||||
error = -file_remove_suid(file);
|
||||
if (unlikely(error))
|
||||
goto out_unlock_internal;
|
||||
|
||||
/* We can write back this queue in page reclaim */
|
||||
current->backing_dev_info = mapping->backing_dev_info;
|
||||
|
||||
if ((ioflags & IO_ISDIRECT)) {
|
||||
if (mapping->nrpages) {
|
||||
WARN_ON(need_i_mutex == 0);
|
||||
error = xfs_flushinval_pages(xip,
|
||||
(pos & PAGE_CACHE_MASK),
|
||||
-1, FI_REMAPF_LOCKED);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
}
|
||||
|
||||
if (need_i_mutex) {
|
||||
/* demote the lock now the cached pages are gone */
|
||||
xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
iolock = XFS_IOLOCK_SHARED;
|
||||
need_i_mutex = 0;
|
||||
}
|
||||
|
||||
trace_xfs_file_direct_write(xip, count, *offset, ioflags);
|
||||
ret = generic_file_direct_write(iocb, iovp,
|
||||
&segs, pos, offset, count, ocount);
|
||||
|
||||
/*
|
||||
* direct-io write to a hole: fall through to buffered I/O
|
||||
* for completing the rest of the request.
|
||||
*/
|
||||
if (ret >= 0 && ret != count) {
|
||||
XFS_STATS_ADD(xs_write_bytes, ret);
|
||||
|
||||
pos += ret;
|
||||
count -= ret;
|
||||
|
||||
ioflags &= ~IO_ISDIRECT;
|
||||
xfs_iunlock(xip, iolock);
|
||||
goto relock;
|
||||
}
|
||||
} else {
|
||||
int enospc = 0;
|
||||
ssize_t ret2 = 0;
|
||||
|
||||
write_retry:
|
||||
trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
|
||||
ret2 = generic_file_buffered_write(iocb, iovp, segs,
|
||||
pos, offset, count, ret);
|
||||
/*
|
||||
* if we just got an ENOSPC, flush the inode now we
|
||||
* aren't holding any page locks and retry *once*
|
||||
*/
|
||||
if (ret2 == -ENOSPC && !enospc) {
|
||||
error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
enospc = 1;
|
||||
goto write_retry;
|
||||
}
|
||||
ret = ret2;
|
||||
}
|
||||
|
||||
current->backing_dev_info = NULL;
|
||||
|
||||
isize = i_size_read(inode);
|
||||
if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
|
||||
*offset = isize;
|
||||
|
||||
if (*offset > xip->i_size) {
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
if (*offset > xip->i_size)
|
||||
xip->i_size = *offset;
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
|
||||
if (ret == -ENOSPC &&
|
||||
DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
|
||||
xfs_iunlock(xip, iolock);
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
|
||||
DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
|
||||
0, 0, 0); /* Delay flag intentionally unused */
|
||||
if (need_i_mutex)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, iolock);
|
||||
if (error)
|
||||
goto out_unlock_internal;
|
||||
goto start;
|
||||
}
|
||||
|
||||
error = -ret;
|
||||
if (ret <= 0)
|
||||
goto out_unlock_internal;
|
||||
|
||||
XFS_STATS_ADD(xs_write_bytes, ret);
|
||||
|
||||
/* Handle various SYNC-type writes */
|
||||
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
|
||||
loff_t end = pos + ret - 1;
|
||||
int error2;
|
||||
|
||||
xfs_iunlock(xip, iolock);
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
error2 = filemap_write_and_wait_range(mapping, pos, end);
|
||||
if (!error)
|
||||
error = error2;
|
||||
if (need_i_mutex)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, iolock);
|
||||
|
||||
error2 = xfs_fsync(xip);
|
||||
if (!error)
|
||||
error = error2;
|
||||
}
|
||||
|
||||
out_unlock_internal:
|
||||
if (xip->i_new_size) {
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
xip->i_new_size = 0;
|
||||
/*
|
||||
* If this was a direct or synchronous I/O that failed (such
|
||||
* as ENOSPC) then part of the I/O may have been written to
|
||||
* disk before the error occured. In this case the on-disk
|
||||
* file size may have been adjusted beyond the in-memory file
|
||||
* size and now needs to be truncated back.
|
||||
*/
|
||||
if (xip->i_d.di_size > xip->i_size)
|
||||
xip->i_d.di_size = xip->i_size;
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
xfs_iunlock(xip, iolock);
|
||||
out_unlock_mutex:
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return -error;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the underlying (data/log/rt) device is readonly, there are some
|
||||
* operations that cannot proceed.
|
||||
*/
|
||||
int
|
||||
xfs_dev_is_read_only(
|
||||
xfs_mount_t *mp,
|
||||
char *message)
|
||||
{
|
||||
if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
|
||||
xfs_readonly_buftarg(mp->m_logdev_targp) ||
|
||||
(mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
|
||||
cmn_err(CE_NOTE,
|
||||
"XFS: %s required on read-only device.", message);
|
||||
cmn_err(CE_NOTE,
|
||||
"XFS: write access unavailable, cannot proceed.");
|
||||
return EROFS;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
@ -2052,6 +2052,26 @@ xfs_mount_log_sb(
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the underlying (data/log/rt) device is readonly, there are some
|
||||
* operations that cannot proceed.
|
||||
*/
|
||||
int
|
||||
xfs_dev_is_read_only(
|
||||
struct xfs_mount *mp,
|
||||
char *message)
|
||||
{
|
||||
if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
|
||||
xfs_readonly_buftarg(mp->m_logdev_targp) ||
|
||||
(mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
|
||||
cmn_err(CE_NOTE,
|
||||
"XFS: %s required on read-only device.", message);
|
||||
cmn_err(CE_NOTE,
|
||||
"XFS: write access unavailable, cannot proceed.");
|
||||
return EROFS;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef HAVE_PERCPU_SB
|
||||
/*
|
||||
|
||||
@ -50,18 +50,6 @@ int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
|
||||
int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
|
||||
int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
|
||||
int flags, struct attrlist_cursor_kern *cursor);
|
||||
ssize_t xfs_read(struct xfs_inode *ip, struct kiocb *iocb,
|
||||
const struct iovec *iovp, unsigned int segs,
|
||||
loff_t *offset, int ioflags);
|
||||
ssize_t xfs_splice_read(struct xfs_inode *ip, struct file *infilp,
|
||||
loff_t *ppos, struct pipe_inode_info *pipe, size_t count,
|
||||
int flags, int ioflags);
|
||||
ssize_t xfs_splice_write(struct xfs_inode *ip,
|
||||
struct pipe_inode_info *pipe, struct file *outfilp,
|
||||
loff_t *ppos, size_t count, int flags, int ioflags);
|
||||
ssize_t xfs_write(struct xfs_inode *xip, struct kiocb *iocb,
|
||||
const struct iovec *iovp, unsigned int nsegs,
|
||||
loff_t *offset, int ioflags);
|
||||
int xfs_bmap(struct xfs_inode *ip, xfs_off_t offset, ssize_t count,
|
||||
int flags, struct xfs_iomap *iomapp, int *niomaps);
|
||||
void xfs_tosspages(struct xfs_inode *inode, xfs_off_t first,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user