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path: root/fs/xfs/libxfs/xfs_trans_resv.c
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2017-07-07xfs: rename MAXPATHLEN to XFS_SYMLINK_MAXLENDarrick J. Wong
XFS has a maximum symlink target length of 1024 bytes; this is a holdover from the Irix days. Unfortunately, the constant establishing this is 'MAXPATHLEN' and is /not/ the same as the Linux MAXPATHLEN, which is 4096. The kernel enforces its 1024 byte MAXPATHLEN on symlink targets, but xfsprogs picks up the (Linux) system 4096 byte MAXPATHLEN, which means that xfs_repair doesn't complain about oversized symlinks. Since this is an on-disk format constraint, put the define in the XFS namespace and move everything over to use the new name. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2016-10-05xfs: increase log reservations for reflinkDarrick J. Wong
Increase the log reservations to handle the increased rolling that happens at the end of copy-on-write operations. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2016-10-03xfs: account for the refcount btree in the alloc/free log reservationDarrick J. Wong
Every time we allocate or free a data extent, we might need to split the refcount btree. Reserve some blocks in the transaction to handle this possibility. Even though the deferred refcount code can roll a transaction to avoid overloading the transaction, we can still exceed the reservation. Certain pathological workloads (1k blocks, no cowextsize hint, random directio writes), cause a perfect storm wherein a refcount adjustment of a large range of blocks causes full tree splits in two separate extents in two separate refcount tree blocks; allocating new refcount tree blocks causes rmap btree splits; and all the allocation activity causes the freespace btrees to split, blowing the reservation. (Reproduced by generic/167 over NFS atop XFS) Signed-off-by: Christoph Hellwig <hch@lst.de> [darrick.wong@oracle.com: add commit message] Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2016-10-03xfs: define the on-disk refcount btree formatDarrick J. Wong
Start constructing the refcount btree implementation by establishing the on-disk format and everything needed to read, write, and manipulate the refcount btree blocks. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de>
2016-08-03xfs: rmap btree transaction reservationsDarrick J. Wong
The rmap btrees will use the AGFL as the block allocation source, so we need to ensure that the transaction reservations reflect the fact this tree is modified by allocation and freeing. Hence we need to extend all the extent allocation/free reservations used in transactions to handle this. Note that this also gets rid of the unused XFS_ALLOCFREE_LOG_RES macro, as we now do buffer reservations based on the number of buffers logged via xfs_calc_buf_res(). Hence we only need the buffer count calculation now. [darrick: use rmap_maxlevels when calculating log block resv] Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2016-08-03xfs: change xfs_bmap_{finish,cancel,init,free} -> xfs_defer_*Darrick J. Wong
Drop the compatibility shims that we were using to integrate the new deferred operation mechanism into the existing code. No new code. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2015-01-22xfs: consolidate superblock logging functionsDave Chinner
We now have several superblock loggin functions that are identical except for the transaction reservation and whether it shoul dbe a synchronous transaction or not. Consolidate these all into a single function, a single reserveration and a sync flag and call it xfs_sync_sb(). Also, xfs_mod_sb() is not really a modification function - it's the operation of logging the superblock buffer. hence change the name of it to reflect this. Note that we have to change the mp->m_update_flags that are passed around at mount time to a boolean simply to indicate a superblock update is needed. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-11-28xfs: move most of xfs_sb.h to xfs_format.hChristoph Hellwig
More on-disk format consolidation. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-11-28xfs: merge xfs_ag.h into xfs_format.hChristoph Hellwig
More on-disk format consolidation. A few declarations that weren't on-disk format related move into better suitable spots. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-06-25libxfs: move source filesDave Chinner
Move all the source files that are shared with userspace into libxfs/. This is done as one big chunk simpy to get it done quickly Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>