076830c068
Change-Id: I0ceba9a993e8b1cdef4ff6a784bfd69c08107d88 BUG: 811311 Signed-off-by: Vijay Bellur <vijay@gluster.com> Reviewed-on: http://review.gluster.com/3116 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Amar Tumballi <amarts@redhat.com> Reviewed-by: Anand Avati <avati@redhat.com>
45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
Solaris Extended Attributes
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In solaris extended attributes are logically supported as files
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within the filesystem. The file system is therefore augmented
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with an orthogonal namespace of file attributes. Attribute values
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are accessed by file descriptors obtained through a special attribute
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interface. This type of logical view of "attributes as files" allows
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the leveraging of existing file system interface functionality to
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support the construction, deletion and manipulation of attributes.
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But as we have tested through this functionality provided by Solaris
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we have come accross two major issues as written below.
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1. Symlink XATTR_NOFOLLOW not present for creating extended attributes
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directly on the symlinks like other platforms Linux,MAC-OSX,BSD etc.
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An implementation is present for O_NOFOLLOW for "openat()" call sets
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up errno ELOOP whenever encountered with a symlink and also another
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implementation AT_SYMLINK_NOFOLLOW which is not present for calls like
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"attropen(), openat()"
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a snippet of test code which helped us understand this behaviour
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--------------------------------------
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attrfd = attropen (path, key,
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flags|AT_SYMLINK_NOFOLLOW|O_CREAT|O_WRONLY|O_NOFOLLOW, 0777);
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if (attrfd >= 0) {
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ftruncate (attrfd, 0);
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ret = write (attrfd, value, size);
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close (attrfd);
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} else {
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fprintf (stderr, "Couldn't set extended attribute for %s (%d)\n",
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path, errno);
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}
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--------------------------------------
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2. Extended attribute support for special files like device files, fifo files
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is not supported under solaris.
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Apart from these glitches almost everything regarding porting functionality
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for extended attribute calls has been properly implemented in compat.c
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with writing wrapper around functions over
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"attropen()", "openat()", "unlinkat()"
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