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xfs: split out the remote symlink handling
The remote symlink format definition and manipulation needs to be shared with userspace, but the in-kernel interfaces do not. Split the remote symlink format handling out into xfs_symlink_remote.[ch] fo it can easily be shared with userspace. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner
Ben Myers
parent
fde2227ce1
commit
1fb7e48db6
@ -50,6 +50,7 @@ xfs-y += xfs_aops.o \
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xfs_mru_cache.o \
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xfs_rename.o \
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xfs_super.o \
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xfs_symlink.o \
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xfs_trans.o \
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xfs_utils.o \
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xfs_vnodeops.o \
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@ -81,7 +82,7 @@ xfs-y += xfs_alloc.o \
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xfs_inode_buf.o \
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xfs_log_recover.o \
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xfs_mount.o \
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xfs_symlink.o \
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xfs_symlink_remote.o \
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xfs_trans_resv.o
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# low-level transaction/log code
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@ -27,6 +27,12 @@
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* xfs_log_format.h. Everything else goes here.
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*/
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_inode;
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struct xfs_buf;
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struct xfs_ifork;
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/*
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* RealTime Device format definitions
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*/
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@ -123,5 +129,41 @@ typedef struct xfs_dqblk {
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#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)
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/*
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* Remote symlink format and access functions.
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*/
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#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
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struct xfs_dsymlink_hdr {
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__be32 sl_magic;
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__be32 sl_offset;
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__be32 sl_bytes;
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__be32 sl_crc;
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uuid_t sl_uuid;
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__be64 sl_owner;
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__be64 sl_blkno;
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__be64 sl_lsn;
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};
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/*
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* The maximum pathlen is 1024 bytes. Since the minimum file system
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* blocksize is 512 bytes, we can get a max of 3 extents back from
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* bmapi when crc headers are taken into account.
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*/
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#define XFS_SYMLINK_MAPS 3
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#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
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((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
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sizeof(struct xfs_dsymlink_hdr) : 0))
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int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
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int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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bool xfs_symlink_hdr_ok(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_inode *ip, struct xfs_ifork *ifp);
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extern const struct xfs_buf_ops xfs_symlink_buf_ops;
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#endif /* __XFS_FORMAT_H__ */
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@ -32,8 +32,6 @@
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#include "xfs_ialloc_btree.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_itable.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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@ -41,178 +39,8 @@
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#include "xfs_quota.h"
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#include "xfs_utils.h"
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#include "xfs_trans_space.h"
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#include "xfs_log_priv.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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#include "xfs_cksum.h"
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#include "xfs_buf_item.h"
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/*
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* Each contiguous block has a header, so it is not just a simple pathlen
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* to FSB conversion.
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*/
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int
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xfs_symlink_blocks(
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struct xfs_mount *mp,
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int pathlen)
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{
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int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
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return (pathlen + buflen - 1) / buflen;
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}
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static int
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xfs_symlink_hdr_set(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return 0;
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dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);
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dsl->sl_offset = cpu_to_be32(offset);
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dsl->sl_bytes = cpu_to_be32(size);
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uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_uuid);
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dsl->sl_owner = cpu_to_be64(ino);
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dsl->sl_blkno = cpu_to_be64(bp->b_bn);
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bp->b_ops = &xfs_symlink_buf_ops;
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return sizeof(struct xfs_dsymlink_hdr);
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}
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/*
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* Checking of the symlink header is split into two parts. the verifier does
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* CRC, location and bounds checking, the unpacking function checks the path
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* parameters and owner.
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*/
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bool
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xfs_symlink_hdr_ok(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (offset != be32_to_cpu(dsl->sl_offset))
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return false;
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if (size != be32_to_cpu(dsl->sl_bytes))
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return false;
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if (ino != be64_to_cpu(dsl->sl_owner))
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return false;
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/* ok */
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return true;
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}
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static bool
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xfs_symlink_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
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return false;
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if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (bp->b_bn != be64_to_cpu(dsl->sl_blkno))
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return false;
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if (be32_to_cpu(dsl->sl_offset) +
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be32_to_cpu(dsl->sl_bytes) >= MAXPATHLEN)
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return false;
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if (dsl->sl_owner == 0)
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return false;
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return true;
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}
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static void
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xfs_symlink_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
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offsetof(struct xfs_dsymlink_hdr, sl_crc)) ||
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!xfs_symlink_verify(bp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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}
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}
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static void
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xfs_symlink_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_buf_log_item *bip = bp->b_fspriv;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (!xfs_symlink_verify(bp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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return;
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}
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if (bip) {
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn);
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}
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xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
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offsetof(struct xfs_dsymlink_hdr, sl_crc));
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}
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const struct xfs_buf_ops xfs_symlink_buf_ops = {
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.verify_read = xfs_symlink_read_verify,
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.verify_write = xfs_symlink_write_verify,
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};
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void
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xfs_symlink_local_to_remote(
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struct xfs_trans *tp,
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struct xfs_buf *bp,
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struct xfs_inode *ip,
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struct xfs_ifork *ifp)
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{
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struct xfs_mount *mp = ip->i_mount;
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char *buf;
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if (!xfs_sb_version_hascrc(&mp->m_sb)) {
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bp->b_ops = NULL;
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memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
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return;
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}
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/*
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* As this symlink fits in an inode literal area, it must also fit in
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* the smallest buffer the filesystem supports.
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*/
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ASSERT(BBTOB(bp->b_length) >=
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ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr));
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bp->b_ops = &xfs_symlink_buf_ops;
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buf = bp->b_addr;
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buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp);
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memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes);
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}
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/* ----- Kernel only functions below ----- */
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STATIC int
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@ -17,51 +17,11 @@
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#ifndef __XFS_SYMLINK_H
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#define __XFS_SYMLINK_H 1
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_inode;
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struct xfs_buf;
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struct xfs_ifork;
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struct xfs_name;
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#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
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struct xfs_dsymlink_hdr {
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__be32 sl_magic;
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__be32 sl_offset;
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__be32 sl_bytes;
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__be32 sl_crc;
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uuid_t sl_uuid;
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__be64 sl_owner;
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__be64 sl_blkno;
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__be64 sl_lsn;
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};
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/*
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* The maximum pathlen is 1024 bytes. Since the minimum file system
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* blocksize is 512 bytes, we can get a max of 3 extents back from
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* bmapi when crc headers are taken into account.
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*/
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#define XFS_SYMLINK_MAPS 3
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#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
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((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
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sizeof(struct xfs_dsymlink_hdr) : 0))
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int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
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bool xfs_symlink_hdr_ok(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_inode *ip, struct xfs_ifork *ifp);
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extern const struct xfs_buf_ops xfs_symlink_buf_ops;
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#ifdef __KERNEL__
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/* Kernel only symlink defintions */
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int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
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const char *target_path, umode_t mode, struct xfs_inode **ipp);
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int xfs_readlink(struct xfs_inode *ip, char *link);
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int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp);
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#endif /* __KERNEL__ */
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#endif /* __XFS_SYMLINK_H */
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199
fs/xfs/xfs_symlink_remote.c
Normal file
199
fs/xfs/xfs_symlink_remote.c
Normal file
@ -0,0 +1,199 @@
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* Copyright (c) 2012-2013 Red Hat, Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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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_format.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_inode.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_symlink.h"
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#include "xfs_cksum.h"
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#include "xfs_buf_item.h"
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/*
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* Each contiguous block has a header, so it is not just a simple pathlen
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* to FSB conversion.
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*/
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int
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xfs_symlink_blocks(
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struct xfs_mount *mp,
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int pathlen)
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{
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int buflen = XFS_SYMLINK_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
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return (pathlen + buflen - 1) / buflen;
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}
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int
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xfs_symlink_hdr_set(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return 0;
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dsl->sl_magic = cpu_to_be32(XFS_SYMLINK_MAGIC);
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dsl->sl_offset = cpu_to_be32(offset);
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dsl->sl_bytes = cpu_to_be32(size);
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uuid_copy(&dsl->sl_uuid, &mp->m_sb.sb_uuid);
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dsl->sl_owner = cpu_to_be64(ino);
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dsl->sl_blkno = cpu_to_be64(bp->b_bn);
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bp->b_ops = &xfs_symlink_buf_ops;
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return sizeof(struct xfs_dsymlink_hdr);
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}
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/*
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* Checking of the symlink header is split into two parts. the verifier does
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* CRC, location and bounds checking, the unpacking function checks the path
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* parameters and owner.
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*/
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bool
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xfs_symlink_hdr_ok(
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struct xfs_mount *mp,
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xfs_ino_t ino,
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uint32_t offset,
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uint32_t size,
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struct xfs_buf *bp)
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{
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (offset != be32_to_cpu(dsl->sl_offset))
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return false;
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if (size != be32_to_cpu(dsl->sl_bytes))
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return false;
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if (ino != be64_to_cpu(dsl->sl_owner))
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return false;
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/* ok */
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return true;
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}
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static bool
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xfs_symlink_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_dsymlink_hdr *dsl = bp->b_addr;
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (dsl->sl_magic != cpu_to_be32(XFS_SYMLINK_MAGIC))
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return false;
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if (!uuid_equal(&dsl->sl_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (bp->b_bn != be64_to_cpu(dsl->sl_blkno))
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return false;
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if (be32_to_cpu(dsl->sl_offset) +
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be32_to_cpu(dsl->sl_bytes) >= MAXPATHLEN)
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return false;
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if (dsl->sl_owner == 0)
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return false;
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return true;
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}
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static void
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xfs_symlink_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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/* no verification of non-crc buffers */
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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|
||||
if (!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
|
||||
offsetof(struct xfs_dsymlink_hdr, sl_crc)) ||
|
||||
!xfs_symlink_verify(bp)) {
|
||||
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
|
||||
xfs_buf_ioerror(bp, EFSCORRUPTED);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
xfs_symlink_write_verify(
|
||||
struct xfs_buf *bp)
|
||||
{
|
||||
struct xfs_mount *mp = bp->b_target->bt_mount;
|
||||
struct xfs_buf_log_item *bip = bp->b_fspriv;
|
||||
|
||||
/* no verification of non-crc buffers */
|
||||
if (!xfs_sb_version_hascrc(&mp->m_sb))
|
||||
return;
|
||||
|
||||
if (!xfs_symlink_verify(bp)) {
|
||||
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
|
||||
xfs_buf_ioerror(bp, EFSCORRUPTED);
|
||||
return;
|
||||
}
|
||||
|
||||
if (bip) {
|
||||
struct xfs_dsymlink_hdr *dsl = bp->b_addr;
|
||||
dsl->sl_lsn = cpu_to_be64(bip->bli_item.li_lsn);
|
||||
}
|
||||
xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
|
||||
offsetof(struct xfs_dsymlink_hdr, sl_crc));
|
||||
}
|
||||
|
||||
const struct xfs_buf_ops xfs_symlink_buf_ops = {
|
||||
.verify_read = xfs_symlink_read_verify,
|
||||
.verify_write = xfs_symlink_write_verify,
|
||||
};
|
||||
|
||||
void
|
||||
xfs_symlink_local_to_remote(
|
||||
struct xfs_trans *tp,
|
||||
struct xfs_buf *bp,
|
||||
struct xfs_inode *ip,
|
||||
struct xfs_ifork *ifp)
|
||||
{
|
||||
struct xfs_mount *mp = ip->i_mount;
|
||||
char *buf;
|
||||
|
||||
if (!xfs_sb_version_hascrc(&mp->m_sb)) {
|
||||
bp->b_ops = NULL;
|
||||
memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* As this symlink fits in an inode literal area, it must also fit in
|
||||
* the smallest buffer the filesystem supports.
|
||||
*/
|
||||
ASSERT(BBTOB(bp->b_length) >=
|
||||
ifp->if_bytes + sizeof(struct xfs_dsymlink_hdr));
|
||||
|
||||
bp->b_ops = &xfs_symlink_buf_ops;
|
||||
|
||||
buf = bp->b_addr;
|
||||
buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp);
|
||||
memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user