diff options
Diffstat (limited to 'fs/xfs/xfs_da_format.c')
| -rw-r--r-- | fs/xfs/xfs_da_format.c | 220 |
1 files changed, 79 insertions, 141 deletions
diff --git a/fs/xfs/xfs_da_format.c b/fs/xfs/xfs_da_format.c index 01e6f9a..40f18d3 100644 --- a/fs/xfs/xfs_da_format.c +++ b/fs/xfs/xfs_da_format.c @@ -209,31 +209,41 @@ xfs_dir3_sfe_put_ino( /* * Directory data block operations */ -static int -__xfs_dir3_data_entsize( - bool ftype, - int n) -{ - int size = offsetof(struct xfs_dir2_data_entry, name[0]); - size += n; - size += sizeof(xfs_dir2_data_off_t); - if (ftype) - size += sizeof(__uint8_t); - return roundup(size, XFS_DIR2_DATA_ALIGN); -} +/* + * For special situations, the dirent size ends up fixed because we always know + * what the size of the entry is. That's true for the "." and "..", and + * therefore we know that they are a fixed size and hence their offsets are + * constant, as is the first entry. + * + * Hence, this calculation is written as a macro to be able to be calculated at + * compile time and so certain offsets can be calculated directly in the + * structure initaliser via the macro. There are two macros - one for dirents + * with ftype and without so there are no unresolvable conditionals in the + * calculations. We also use round_up() as XFS_DIR2_DATA_ALIGN is always a power + * of 2 and the compiler doesn't reject it (unlike roundup()). + */ +#define XFS_DIR2_DATA_ENTSIZE(n) \ + round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) + \ + sizeof(xfs_dir2_data_off_t)), XFS_DIR2_DATA_ALIGN) + +#define XFS_DIR3_DATA_ENTSIZE(n) \ + round_up((offsetof(struct xfs_dir2_data_entry, name[0]) + (n) + \ + sizeof(xfs_dir2_data_off_t) + sizeof(__uint8_t)), \ + XFS_DIR2_DATA_ALIGN) static int xfs_dir2_data_entsize( int n) { - return __xfs_dir3_data_entsize(false, n); + return XFS_DIR2_DATA_ENTSIZE(n); } + static int xfs_dir3_data_entsize( int n) { - return __xfs_dir3_data_entsize(true, n); + return XFS_DIR3_DATA_ENTSIZE(n); } static __uint8_t @@ -294,45 +304,6 @@ xfs_dir3_data_entry_tag_p( } /* - * Offsets of . and .. in data space (always block 0) - */ -static xfs_dir2_data_aoff_t -xfs_dir2_data_dot_offset(void) -{ - return sizeof(struct xfs_dir2_data_hdr); -} - -static xfs_dir2_data_aoff_t -xfs_dir2_data_dotdot_offset(void) -{ - return xfs_dir2_data_dot_offset() + xfs_dir2_data_entsize(1); -} - -static xfs_dir2_data_aoff_t -xfs_dir2_data_first_offset(void) -{ - return xfs_dir2_data_dotdot_offset() + xfs_dir2_data_entsize(2); -} - -static xfs_dir2_data_aoff_t -xfs_dir3_data_dot_offset(void) -{ - return sizeof(struct xfs_dir3_data_hdr); -} - -static xfs_dir2_data_aoff_t -xfs_dir3_data_dotdot_offset(void) -{ - return xfs_dir3_data_dot_offset() + xfs_dir3_data_entsize(1); -} - -static xfs_dir2_data_aoff_t -xfs_dir3_data_first_offset(void) -{ - return xfs_dir3_data_dotdot_offset() + xfs_dir3_data_entsize(2); -} - -/* * location of . and .. in data space (always block 0) */ static struct xfs_dir2_data_entry * @@ -340,7 +311,7 @@ xfs_dir2_data_dot_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir2_data_dot_offset()); + ((char *)hdr + sizeof(struct xfs_dir2_data_hdr)); } static struct xfs_dir2_data_entry * @@ -348,7 +319,8 @@ xfs_dir2_data_dotdot_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir2_data_dotdot_offset()); + ((char *)hdr + sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR2_DATA_ENTSIZE(1)); } static struct xfs_dir2_data_entry * @@ -356,7 +328,9 @@ xfs_dir2_data_first_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir2_data_first_offset()); + ((char *)hdr + sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR2_DATA_ENTSIZE(1) + + XFS_DIR2_DATA_ENTSIZE(2)); } static struct xfs_dir2_data_entry * @@ -364,7 +338,7 @@ xfs_dir3_data_dot_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir3_data_dot_offset()); + ((char *)hdr + sizeof(struct xfs_dir3_data_hdr)); } static struct xfs_dir2_data_entry * @@ -372,7 +346,8 @@ xfs_dir3_data_dotdot_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir3_data_dotdot_offset()); + ((char *)hdr + sizeof(struct xfs_dir3_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1)); } static struct xfs_dir2_data_entry * @@ -380,7 +355,9 @@ xfs_dir3_data_first_entry_p( struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir3_data_first_offset()); + ((char *)hdr + sizeof(struct xfs_dir3_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1) + + XFS_DIR3_DATA_ENTSIZE(2)); } static struct xfs_dir2_data_free * @@ -395,44 +372,32 @@ xfs_dir3_data_bestfree_p(struct xfs_dir2_data_hdr *hdr) return ((struct xfs_dir3_data_hdr *)hdr)->best_free; } -static size_t -xfs_dir2_data_entry_offset(void) -{ - return sizeof(struct xfs_dir2_data_hdr); -} - static struct xfs_dir2_data_entry * xfs_dir2_data_entry_p(struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir2_data_entry_offset()); + ((char *)hdr + sizeof(struct xfs_dir2_data_hdr)); } static struct xfs_dir2_data_unused * xfs_dir2_data_unused_p(struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_unused *) - ((char *)hdr + xfs_dir2_data_entry_offset()); -} - -static size_t -xfs_dir3_data_entry_offset(void) -{ - return sizeof(struct xfs_dir3_data_hdr); + ((char *)hdr + sizeof(struct xfs_dir2_data_hdr)); } static struct xfs_dir2_data_entry * xfs_dir3_data_entry_p(struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_entry *) - ((char *)hdr + xfs_dir3_data_entry_offset()); + ((char *)hdr + sizeof(struct xfs_dir3_data_hdr)); } static struct xfs_dir2_data_unused * xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) { return (struct xfs_dir2_data_unused *) - ((char *)hdr + xfs_dir3_data_entry_offset()); + ((char *)hdr + sizeof(struct xfs_dir3_data_hdr)); } @@ -440,15 +405,9 @@ xfs_dir3_data_unused_p(struct xfs_dir2_data_hdr *hdr) * Directory Leaf block operations */ static int -xfs_dir2_leaf_hdr_size(void) -{ - return sizeof(struct xfs_dir2_leaf_hdr); -} - -static int xfs_dir2_max_leaf_ents(struct xfs_mount *mp) { - return (mp->m_dirblksize - xfs_dir2_leaf_hdr_size()) / + return (mp->m_dirblksize - sizeof(struct xfs_dir2_leaf_hdr)) / (uint)sizeof(struct xfs_dir2_leaf_entry); } @@ -459,15 +418,9 @@ xfs_dir2_leaf_ents_p(struct xfs_dir2_leaf *lp) } static int -xfs_dir3_leaf_hdr_size(void) -{ - return sizeof(struct xfs_dir3_leaf_hdr); -} - -static int xfs_dir3_max_leaf_ents(struct xfs_mount *mp) { - return (mp->m_dirblksize - xfs_dir3_leaf_hdr_size()) / + return (mp->m_dirblksize - sizeof(struct xfs_dir3_leaf_hdr)) / (uint)sizeof(struct xfs_dir2_leaf_entry); } @@ -545,25 +498,13 @@ xfs_dir3_leaf_hdr_to_disk( /* * Directory/Attribute Node block operations */ -static inline int -xfs_da2_node_hdr_size(void) -{ - return sizeof(struct xfs_da_node_hdr); -} - static struct xfs_da_node_entry * xfs_da2_node_tree_p(struct xfs_da_intnode *dap) { return dap->__btree; } -static inline int -xfs_da3_node_hdr_size(void) -{ - return sizeof(struct xfs_da3_node_hdr); -} - -static inline struct xfs_da_node_entry * +static struct xfs_da_node_entry * xfs_da3_node_tree_p(struct xfs_da_intnode *dap) { return ((struct xfs_da3_intnode *)dap)->__btree; @@ -630,22 +571,16 @@ xfs_da3_node_hdr_to_disk( * Directory free space block operations */ static int -xfs_dir2_free_hdr_size(void) -{ - return sizeof(struct xfs_dir2_free_hdr); -} - -static int xfs_dir2_free_max_bests(struct xfs_mount *mp) { - return (mp->m_dirblksize - xfs_dir2_free_hdr_size()) / + return (mp->m_dirblksize - sizeof(struct xfs_dir2_free_hdr)) / sizeof(xfs_dir2_data_off_t); } static __be16 * xfs_dir2_free_bests_p(struct xfs_dir2_free *free) { - return (__be16 *)((char *)free + xfs_dir2_free_hdr_size()); + return (__be16 *)((char *)free + sizeof(struct xfs_dir2_free_hdr)); } /* @@ -667,22 +602,16 @@ xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db) } static int -xfs_dir3_free_hdr_size(void) -{ - return sizeof(struct xfs_dir3_free_hdr); -} - -static int xfs_dir3_free_max_bests(struct xfs_mount *mp) { - return (mp->m_dirblksize - xfs_dir3_free_hdr_size()) / + return (mp->m_dirblksize - sizeof(struct xfs_dir3_free_hdr)) / sizeof(xfs_dir2_data_off_t); } static __be16 * xfs_dir3_free_bests_p(struct xfs_dir2_free *free) { - return (__be16 *)((char *)free + xfs_dir3_free_hdr_size()); + return (__be16 *)((char *)free + sizeof(struct xfs_dir3_free_hdr)); } /* @@ -774,10 +703,13 @@ const struct xfs_dir_ops xfs_dir2_ops = { .data_entry_tag_p = xfs_dir2_data_entry_tag_p, .data_bestfree_p = xfs_dir2_data_bestfree_p, - .data_dot_offset = xfs_dir2_data_dot_offset, - .data_dotdot_offset = xfs_dir2_data_dotdot_offset, - .data_first_offset = xfs_dir2_data_first_offset, - .data_entry_offset = xfs_dir2_data_entry_offset, + .data_dot_offset = sizeof(struct xfs_dir2_data_hdr), + .data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR2_DATA_ENTSIZE(1), + .data_first_offset = sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR2_DATA_ENTSIZE(1) + + XFS_DIR2_DATA_ENTSIZE(2), + .data_entry_offset = sizeof(struct xfs_dir2_data_hdr), .data_dot_entry_p = xfs_dir2_data_dot_entry_p, .data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p, @@ -785,18 +717,18 @@ const struct xfs_dir_ops xfs_dir2_ops = { .data_entry_p = xfs_dir2_data_entry_p, .data_unused_p = xfs_dir2_data_unused_p, - .leaf_hdr_size = xfs_dir2_leaf_hdr_size, + .leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr), .leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk, .leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk, .leaf_max_ents = xfs_dir2_max_leaf_ents, .leaf_ents_p = xfs_dir2_leaf_ents_p, - .node_hdr_size = xfs_da2_node_hdr_size, + .node_hdr_size = sizeof(struct xfs_da_node_hdr), .node_hdr_to_disk = xfs_da2_node_hdr_to_disk, .node_hdr_from_disk = xfs_da2_node_hdr_from_disk, .node_tree_p = xfs_da2_node_tree_p, - .free_hdr_size = xfs_dir2_free_hdr_size, + .free_hdr_size = sizeof(struct xfs_dir2_free_hdr), .free_hdr_to_disk = xfs_dir2_free_hdr_to_disk, .free_hdr_from_disk = xfs_dir2_free_hdr_from_disk, .free_max_bests = xfs_dir2_free_max_bests, @@ -821,10 +753,13 @@ const struct xfs_dir_ops xfs_dir2_ftype_ops = { .data_entry_tag_p = xfs_dir3_data_entry_tag_p, .data_bestfree_p = xfs_dir2_data_bestfree_p, - .data_dot_offset = xfs_dir2_data_dot_offset, - .data_dotdot_offset = xfs_dir2_data_dotdot_offset, - .data_first_offset = xfs_dir2_data_first_offset, - .data_entry_offset = xfs_dir2_data_entry_offset, + .data_dot_offset = sizeof(struct xfs_dir2_data_hdr), + .data_dotdot_offset = sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1), + .data_first_offset = sizeof(struct xfs_dir2_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1) + + XFS_DIR3_DATA_ENTSIZE(2), + .data_entry_offset = sizeof(struct xfs_dir2_data_hdr), .data_dot_entry_p = xfs_dir2_data_dot_entry_p, .data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p, @@ -832,18 +767,18 @@ const struct xfs_dir_ops xfs_dir2_ftype_ops = { .data_entry_p = xfs_dir2_data_entry_p, .data_unused_p = xfs_dir2_data_unused_p, - .leaf_hdr_size = xfs_dir2_leaf_hdr_size, + .leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr), .leaf_hdr_to_disk = xfs_dir2_leaf_hdr_to_disk, .leaf_hdr_from_disk = xfs_dir2_leaf_hdr_from_disk, .leaf_max_ents = xfs_dir2_max_leaf_ents, .leaf_ents_p = xfs_dir2_leaf_ents_p, - .node_hdr_size = xfs_da2_node_hdr_size, + .node_hdr_size = sizeof(struct xfs_da_node_hdr), .node_hdr_to_disk = xfs_da2_node_hdr_to_disk, .node_hdr_from_disk = xfs_da2_node_hdr_from_disk, .node_tree_p = xfs_da2_node_tree_p, - .free_hdr_size = xfs_dir2_free_hdr_size, + .free_hdr_size = sizeof(struct xfs_dir2_free_hdr), .free_hdr_to_disk = xfs_dir2_free_hdr_to_disk, .free_hdr_from_disk = xfs_dir2_free_hdr_from_disk, .free_max_bests = xfs_dir2_free_max_bests, @@ -868,10 +803,13 @@ const struct xfs_dir_ops xfs_dir3_ops = { .data_entry_tag_p = xfs_dir3_data_entry_tag_p, .data_bestfree_p = xfs_dir3_data_bestfree_p, - .data_dot_offset = xfs_dir3_data_dot_offset, - .data_dotdot_offset = xfs_dir3_data_dotdot_offset, - .data_first_offset = xfs_dir3_data_first_offset, - .data_entry_offset = xfs_dir3_data_entry_offset, + .data_dot_offset = sizeof(struct xfs_dir3_data_hdr), + .data_dotdot_offset = sizeof(struct xfs_dir3_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1), + .data_first_offset = sizeof(struct xfs_dir3_data_hdr) + + XFS_DIR3_DATA_ENTSIZE(1) + + XFS_DIR3_DATA_ENTSIZE(2), + .data_entry_offset = sizeof(struct xfs_dir3_data_hdr), .data_dot_entry_p = xfs_dir3_data_dot_entry_p, .data_dotdot_entry_p = xfs_dir3_data_dotdot_entry_p, @@ -879,18 +817,18 @@ const struct xfs_dir_ops xfs_dir3_ops = { .data_entry_p = xfs_dir3_data_entry_p, .data_unused_p = xfs_dir3_data_unused_p, - .leaf_hdr_size = xfs_dir3_leaf_hdr_size, + .leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr), .leaf_hdr_to_disk = xfs_dir3_leaf_hdr_to_disk, .leaf_hdr_from_disk = xfs_dir3_leaf_hdr_from_disk, .leaf_max_ents = xfs_dir3_max_leaf_ents, .leaf_ents_p = xfs_dir3_leaf_ents_p, - .node_hdr_size = xfs_da3_node_hdr_size, + .node_hdr_size = sizeof(struct xfs_da3_node_hdr), .node_hdr_to_disk = xfs_da3_node_hdr_to_disk, .node_hdr_from_disk = xfs_da3_node_hdr_from_disk, .node_tree_p = xfs_da3_node_tree_p, - .free_hdr_size = xfs_dir3_free_hdr_size, + .free_hdr_size = sizeof(struct xfs_dir3_free_hdr), .free_hdr_to_disk = xfs_dir3_free_hdr_to_disk, .free_hdr_from_disk = xfs_dir3_free_hdr_from_disk, .free_max_bests = xfs_dir3_free_max_bests, @@ -900,14 +838,14 @@ const struct xfs_dir_ops xfs_dir3_ops = { }; const struct xfs_dir_ops xfs_dir2_nondir_ops = { - .node_hdr_size = xfs_da2_node_hdr_size, + .node_hdr_size = sizeof(struct xfs_da_node_hdr), .node_hdr_to_disk = xfs_da2_node_hdr_to_disk, .node_hdr_from_disk = xfs_da2_node_hdr_from_disk, .node_tree_p = xfs_da2_node_tree_p, }; const struct xfs_dir_ops xfs_dir3_nondir_ops = { - .node_hdr_size = xfs_da3_node_hdr_size, + .node_hdr_size = sizeof(struct xfs_da3_node_hdr), .node_hdr_to_disk = xfs_da3_node_hdr_to_disk, .node_hdr_from_disk = xfs_da3_node_hdr_from_disk, .node_tree_p = xfs_da3_node_tree_p, |