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author | Brian Foster <bfoster@redhat.com> | 2012-11-06 15:50:38 +0100 |
---|---|---|
committer | Ben Myers <bpm@sgi.com> | 2012-11-08 21:20:44 +0100 |
commit | 27b52867925e3aaed090063c1c58a7537e6373f3 (patch) | |
tree | 901719517ac8dc751053f6bf9d86cbe2b73bf538 /fs/xfs/xfs_iomap.c | |
parent | xfs: report projid32bit feature in geometry call (diff) | |
download | linux-27b52867925e3aaed090063c1c58a7537e6373f3.tar.xz linux-27b52867925e3aaed090063c1c58a7537e6373f3.zip |
xfs: add EOFBLOCKS inode tagging/untagging
Add the XFS_ICI_EOFBLOCKS_TAG inode tag to identify inodes with
speculatively preallocated blocks beyond EOF. An inode is tagged
when speculative preallocation occurs and untagged either via
truncate down or when post-EOF blocks are freed via release or
reclaim.
The tag management is intentionally not aggressive to prefer
simplicity over the complexity of handling all the corner cases
under which post-EOF blocks could be freed (i.e., forward
truncation, fallocate, write error conditions, etc.). This means
that a tagged inode may or may not have post-EOF blocks after a
period of time. The tag is eventually cleared when the inode is
released or reclaimed.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
-rw-r--r-- | fs/xfs/xfs_iomap.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index a066cf1766ab..add06b4e9a63 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -41,6 +41,7 @@ #include "xfs_utils.h" #include "xfs_iomap.h" #include "xfs_trace.h" +#include "xfs_icache.h" #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ @@ -450,6 +451,13 @@ retry: if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) return xfs_alert_fsblock_zero(ip, &imap[0]); + /* + * Tag the inode as speculatively preallocated so we can reclaim this + * space on demand, if necessary. + */ + if (prealloc) + xfs_inode_set_eofblocks_tag(ip); + *ret_imap = imap[0]; return 0; } |