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Merge pull request #17693 from yuwata/tmpfiles-compress-nocow-on-btrfs
tmpfiles: try to set file attributes one by one
This commit is contained in:
commit
fd4835bdf8
@ -10,25 +10,31 @@
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#include "fd-util.h"
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#include "macro.h"
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int chattr_fd(int fd, unsigned value, unsigned mask, unsigned *previous) {
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int chattr_full(const char *path, int fd, unsigned value, unsigned mask, unsigned *ret_previous, unsigned *ret_final, bool fallback) {
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_cleanup_close_ int fd_will_close = -1;
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unsigned old_attr, new_attr;
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struct stat st;
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assert(fd >= 0);
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assert(path || fd >= 0);
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if (fd < 0) {
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fd = fd_will_close = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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}
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if (fstat(fd, &st) < 0)
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return -errno;
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/* Explicitly check whether this is a regular file or
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* directory. If it is anything else (such as a device node or
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* fifo), then the ioctl will not hit the file systems but
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* possibly drivers, where the ioctl might have different
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* effects. Notably, DRM is using the same ioctl() number. */
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/* Explicitly check whether this is a regular file or directory. If it is anything else (such
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* as a device node or fifo), then the ioctl will not hit the file systems but possibly
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* drivers, where the ioctl might have different effects. Notably, DRM is using the same
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* ioctl() number. */
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if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
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return -ENOTTY;
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if (mask == 0 && !previous)
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if (mask == 0 && !ret_previous && !ret_final)
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return 0;
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if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
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@ -36,33 +42,55 @@ int chattr_fd(int fd, unsigned value, unsigned mask, unsigned *previous) {
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new_attr = (old_attr & ~mask) | (value & mask);
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if (new_attr == old_attr) {
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if (previous)
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*previous = old_attr;
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if (ret_previous)
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*ret_previous = old_attr;
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if (ret_final)
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*ret_final = old_attr;
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return 0;
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}
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if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
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if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) >= 0) {
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if (ret_previous)
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*ret_previous = old_attr;
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if (ret_final)
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*ret_final = new_attr;
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return 1;
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}
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if (errno != EINVAL || !fallback)
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return -errno;
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if (previous)
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*previous = old_attr;
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/* When -EINVAL is returned, we assume that incompatible attributes are simultaneously
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* specified. E.g., compress(c) and nocow(C) attributes cannot be set to files on btrfs.
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* As a fallback, let's try to set attributes one by one. */
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return 1;
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}
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unsigned current_attr = old_attr;
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for (unsigned i = 0; i < sizeof(unsigned) * 8; i++) {
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unsigned new_one, mask_one = 1u << i;
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int chattr_path(const char *p, unsigned value, unsigned mask, unsigned *previous) {
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_cleanup_close_ int fd = -1;
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if (!FLAGS_SET(mask, mask_one))
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continue;
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assert(p);
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new_one = UPDATE_FLAG(current_attr, mask_one, FLAGS_SET(value, mask_one));
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if (new_one == current_attr)
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continue;
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if (mask == 0)
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return 0;
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if (ioctl(fd, FS_IOC_SETFLAGS, &new_one) < 0) {
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if (errno != EINVAL)
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return -errno;
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continue;
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}
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
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if (fd < 0)
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return -errno;
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if (ioctl(fd, FS_IOC_GETFLAGS, ¤t_attr) < 0)
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return -errno;
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}
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return chattr_fd(fd, value, mask, previous);
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if (ret_previous)
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*ret_previous = old_attr;
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if (ret_final)
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*ret_final = current_attr;
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return current_attr == new_attr ? 1 : -ENOANO; /* -ENOANO indicates that some attributes cannot be set. */
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}
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int read_attr_fd(int fd, unsigned *ret) {
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@ -2,6 +2,8 @@
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#pragma once
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#include <linux/fs.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "missing_fs.h"
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@ -32,8 +34,13 @@
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FS_NOCOW_FL | \
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FS_PROJINHERIT_FL)
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int chattr_fd(int fd, unsigned value, unsigned mask, unsigned *previous);
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int chattr_path(const char *p, unsigned value, unsigned mask, unsigned *previous);
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int chattr_full(const char *path, int fd, unsigned value, unsigned mask, unsigned *ret_previous, unsigned *ret_final, bool fallback);
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static inline int chattr_fd(int fd, unsigned value, unsigned mask, unsigned *previous) {
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return chattr_full(NULL, fd, value, mask, previous, NULL, false);
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}
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static inline int chattr_path(const char *path, unsigned value, unsigned mask, unsigned *previous) {
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return chattr_full(path, -1, value, mask, previous, NULL, false);
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}
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int read_attr_fd(int fd, unsigned *ret);
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int read_attr_path(const char *p, unsigned *ret);
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@ -1308,11 +1308,15 @@ static int fd_set_attribute(Item *item, int fd, const char *path, const struct s
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if (procfs_fd < 0)
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return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
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r = chattr_fd(procfs_fd, f, item->attribute_mask, NULL);
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if (r < 0)
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log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING,
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r,
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"Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
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unsigned previous, current;
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r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, ¤t, true);
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if (r == -ENOANO)
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log_warning("Cannot set file attributes for '%s', maybe due to incompatiblity in specified attributes, "
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"previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
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path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
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else if (r < 0)
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log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
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"Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
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path, item->attribute_value, item->attribute_mask);
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return 0;
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