Supporting a small bit of data inside the inode fork blows up the fork size
a lot, removing the 32 bytes of inline data halves the effective size of
the inode fork (and it still has a lot of unused padding left), and the
performance of a single kmalloc doesn't show up compared to the size to read
an inode or create one.
It also simplifies the fork management code a lot.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/xfs/libxfs/xfs_inode_fork.c | 185 +++--------------------------------------
fs/xfs/libxfs/xfs_inode_fork.h | 11 ---
fs/xfs/xfs_bmap_util.c | 15 ----
3 files changed, 13 insertions(+), 198 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index c9e10d4818b7..5ac341d2b093 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -269,19 +269,14 @@ xfs_init_local_fork(
if (zero_terminate)
mem_size++;
- if (size == 0)
- ifp->if_u1.if_data = NULL;
- else if (mem_size <= sizeof(ifp->if_u2.if_inline_data))
- ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
- else {
+ if (size) {
real_size = roundup(mem_size, 4);
ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS);
- }
-
- if (size) {
memcpy(ifp->if_u1.if_data, data, size);
if (zero_terminate)
ifp->if_u1.if_data[size] = '\0';
+ } else {
+ ifp->if_u1.if_data = NULL;
}
ifp->if_bytes = size;
@@ -292,13 +287,6 @@ xfs_init_local_fork(
/*
* The file is in-lined in the on-disk inode.
- * If it fits into if_inline_data, then copy
- * it there, otherwise allocate a buffer for it
- * and copy the data there. Either way, set
- * if_data to point at the data.
- * If we allocate a buffer for the data, make
- * sure that its size is a multiple of 4 and
- * record the real size in i_real_bytes.
*/
STATIC int
xfs_iformat_local(
@@ -328,9 +316,7 @@ xfs_iformat_local(
/*
* The file consists of a set of extents all of which fit into the on-disk
- * inode. If there are few enough extents to fit into the if_inline_ext, then
- * copy them there. Otherwise allocate a buffer for them and copy them into it.
- * Either way, set if_extents to point at the extents.
+ * inode.
*/
STATIC int
xfs_iformat_extents(
@@ -362,8 +348,6 @@ xfs_iformat_extents(
ifp->if_real_bytes = 0;
if (nex == 0)
ifp->if_u1.if_extents = NULL;
- else if (nex <= XFS_INLINE_EXTS)
- ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
else
xfs_iext_add(ifp, 0, nex);
@@ -618,26 +602,9 @@ xfs_idata_realloc(
ASSERT(new_size >= 0);
if (new_size == 0) {
- if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
- kmem_free(ifp->if_u1.if_data);
- }
+ kmem_free(ifp->if_u1.if_data);
ifp->if_u1.if_data = NULL;
real_size = 0;
- } else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) {
- /*
- * If the valid extents/data can fit in if_inline_ext/data,
- * copy them from the malloc'd vector and free it.
- */
- if (ifp->if_u1.if_data == NULL) {
- ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
- } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
- ASSERT(ifp->if_real_bytes != 0);
- memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data,
- new_size);
- kmem_free(ifp->if_u1.if_data);
- ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
- }
- real_size = 0;
} else {
/*
* Stuck with malloc/realloc.
@@ -651,7 +618,7 @@ xfs_idata_realloc(
ASSERT(ifp->if_real_bytes == 0);
ifp->if_u1.if_data = kmem_alloc(real_size,
KM_SLEEP | KM_NOFS);
- } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
+ } else {
/*
* Only do the realloc if the underlying size
* is really changing.
@@ -662,12 +629,6 @@ xfs_idata_realloc(
real_size,
KM_SLEEP | KM_NOFS);
}
- } else {
- ASSERT(ifp->if_real_bytes == 0);
- ifp->if_u1.if_data = kmem_alloc(real_size,
- KM_SLEEP | KM_NOFS);
- memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data,
- ifp->if_bytes);
}
}
ifp->if_real_bytes = real_size;
@@ -695,8 +656,7 @@ xfs_idestroy_fork(
* so check and free it up if we do.
*/
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
- if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) &&
- (ifp->if_u1.if_data != NULL)) {
+ if (ifp->if_u1.if_data != NULL) {
ASSERT(ifp->if_real_bytes != 0);
kmem_free(ifp->if_u1.if_data);
ifp->if_u1.if_data = NULL;
@@ -704,13 +664,11 @@ xfs_idestroy_fork(
}
} else if ((ifp->if_flags & XFS_IFEXTENTS) &&
((ifp->if_flags & XFS_IFEXTIREC) ||
- ((ifp->if_u1.if_extents != NULL) &&
- (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) {
+ (ifp->if_u1.if_extents != NULL))) {
ASSERT(ifp->if_real_bytes != 0);
xfs_iext_destroy(ifp);
}
- ASSERT(ifp->if_u1.if_extents == NULL ||
- ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext);
+ ASSERT(ifp->if_u1.if_extents == NULL);
ASSERT(ifp->if_real_bytes == 0);
if (whichfork == XFS_ATTR_FORK) {
kmem_zone_free(xfs_ifork_zone, ip->i_afp);
@@ -943,28 +901,14 @@ xfs_iext_add(
ASSERT((idx >= 0) && (idx <= nextents));
byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
new_size = ifp->if_bytes + byte_diff;
+
/*
- * If the new number of extents (nextents + ext_diff)
- * fits inside the inode, then continue to use the inline
- * extent buffer.
- */
- if (nextents + ext_diff <= XFS_INLINE_EXTS) {
- if (idx < nextents) {
- memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff],
- &ifp->if_u2.if_inline_ext[idx],
- (nextents - idx) * sizeof(xfs_bmbt_rec_t));
- memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff);
- }
- ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
- ifp->if_real_bytes = 0;
- }
- /*
- * Otherwise use a linear (direct) extent list.
+ * Use a linear (direct) extent list.
* If the extents are currently inside the inode,
* xfs_iext_realloc_direct will switch us from
* inline to direct extent allocation mode.
*/
- else if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
+ if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
xfs_iext_realloc_direct(ifp, new_size);
if (idx < nextents) {
memmove(&ifp->if_u1.if_extents[idx + ext_diff],
@@ -1172,43 +1116,10 @@ xfs_iext_remove(
xfs_iext_remove_indirect(ifp, cur->idx, ext_diff);
} else if (ifp->if_real_bytes) {
xfs_iext_remove_direct(ifp, cur->idx, ext_diff);
- } else {
- xfs_iext_remove_inline(ifp, cur->idx, ext_diff);
}
ifp->if_bytes = new_size;
}
-/*
- * This removes ext_diff extents from the inline buffer, beginning
- * at extent index idx.
- */
-void
-xfs_iext_remove_inline(
- xfs_ifork_t *ifp, /* inode fork pointer */
- xfs_extnum_t idx, /* index to begin removing exts */
- int ext_diff) /* number of extents to remove */
-{
- int nextents; /* number of extents in file */
-
- ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
- ASSERT(idx < XFS_INLINE_EXTS);
- nextents = xfs_iext_count(ifp);
- ASSERT(((nextents - ext_diff) > 0) &&
- (nextents - ext_diff) < XFS_INLINE_EXTS);
-
- if (idx + ext_diff < nextents) {
- memmove(&ifp->if_u2.if_inline_ext[idx],
- &ifp->if_u2.if_inline_ext[idx + ext_diff],
- (nextents - (idx + ext_diff)) *
- sizeof(xfs_bmbt_rec_t));
- memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff],
- 0, ext_diff * sizeof(xfs_bmbt_rec_t));
- } else {
- memset(&ifp->if_u2.if_inline_ext[idx], 0,
- ext_diff * sizeof(xfs_bmbt_rec_t));
- }
-}
-
/*
* This removes ext_diff extents from a linear (direct) extent list,
* beginning at extent index idx. If the extents are being removed
@@ -1351,16 +1262,7 @@ xfs_iext_realloc_direct(
/* Free extent records */
if (new_size == 0) {
xfs_iext_destroy(ifp);
- }
- /* Resize direct extent list and zero any new bytes */
- else if (ifp->if_real_bytes) {
- /* Check if extents will fit inside the inode */
- if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) {
- xfs_iext_direct_to_inline(ifp, new_size /
- (uint)sizeof(xfs_bmbt_rec_t));
- ifp->if_bytes = new_size;
- return;
- }
+ } else {
if (!is_power_of_2(new_size)){
rnew_size = roundup_pow_of_two(new_size);
}
@@ -1375,63 +1277,10 @@ xfs_iext_realloc_direct(
rnew_size - ifp->if_real_bytes);
}
}
- /* Switch from the inline extent buffer to a direct extent list */
- else {
- if (!is_power_of_2(new_size)) {
- rnew_size = roundup_pow_of_two(new_size);
- }
- xfs_iext_inline_to_direct(ifp, rnew_size);
- }
ifp->if_real_bytes = rnew_size;
ifp->if_bytes = new_size;
}
-/*
- * Switch from linear (direct) extent records to inline buffer.
- */
-void
-xfs_iext_direct_to_inline(
- xfs_ifork_t *ifp, /* inode fork pointer */
- xfs_extnum_t nextents) /* number of extents in file */
-{
- ASSERT(ifp->if_flags & XFS_IFEXTENTS);
- ASSERT(nextents <= XFS_INLINE_EXTS);
- /*
- * The inline buffer was zeroed when we switched
- * from inline to direct extent allocation mode,
- * so we don't need to clear it here.
- */
- memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents,
- nextents * sizeof(xfs_bmbt_rec_t));
- kmem_free(ifp->if_u1.if_extents);
- ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
- ifp->if_real_bytes = 0;
-}
-
-/*
- * Switch from inline buffer to linear (direct) extent records.
- * new_size should already be rounded up to the next power of 2
- * by the caller (when appropriate), so use new_size as it is.
- * However, since new_size may be rounded up, we can't update
- * if_bytes here. It is the caller's responsibility to update
- * if_bytes upon return.
- */
-void
-xfs_iext_inline_to_direct(
- xfs_ifork_t *ifp, /* inode fork pointer */
- int new_size) /* number of extents in file */
-{
- ifp->if_u1.if_extents = kmem_alloc(new_size, KM_NOFS);
- memset(ifp->if_u1.if_extents, 0, new_size);
- if (ifp->if_bytes) {
- memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext,
- ifp->if_bytes);
- memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
- sizeof(xfs_bmbt_rec_t));
- }
- ifp->if_real_bytes = new_size;
-}
-
/*
* Resize an extent indirection array to new_size bytes.
*/
@@ -1511,9 +1360,6 @@ xfs_iext_destroy(
xfs_iext_irec_remove_all(ifp);
} else if (ifp->if_real_bytes) {
kmem_free(ifp->if_u1.if_extents);
- } else if (ifp->if_bytes) {
- memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
- sizeof(xfs_bmbt_rec_t));
}
ifp->if_u1.if_extents = NULL;
ifp->if_real_bytes = 0;
@@ -1708,8 +1554,6 @@ xfs_iext_irec_init(
if (nextents == 0) {
ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
- } else if (!ifp->if_real_bytes) {
- xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ);
} else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) {
xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ);
}
@@ -1829,9 +1673,6 @@ xfs_iext_irec_compact(
if (nextents == 0) {
xfs_iext_destroy(ifp);
- } else if (nextents <= XFS_INLINE_EXTS) {
- xfs_iext_indirect_to_direct(ifp);
- xfs_iext_direct_to_inline(ifp, nextents);
} else if (nextents <= XFS_LINEAR_EXTS) {
xfs_iext_indirect_to_direct(ifp);
} else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) {
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index dc347dd9dc78..508f13784334 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -51,8 +51,6 @@ typedef struct xfs_ext_irec {
*/
#define XFS_IEXT_BUFSZ 4096
#define XFS_LINEAR_EXTS (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
-#define XFS_INLINE_EXTS 2
-#define XFS_INLINE_DATA 32
typedef struct xfs_ifork {
int if_bytes; /* bytes in if_u1 */
int if_real_bytes; /* bytes allocated in if_u1 */
@@ -64,12 +62,6 @@ typedef struct xfs_ifork {
xfs_ext_irec_t *if_ext_irec; /* irec map file exts */
char *if_data; /* inline file data */
} if_u1;
- union {
- xfs_bmbt_rec_host_t if_inline_ext[XFS_INLINE_EXTS];
- /* very small file extents */
- char if_inline_data[XFS_INLINE_DATA];
- /* very small file data */
- } if_u2;
} xfs_ifork_t;
/*
@@ -158,12 +150,9 @@ void xfs_iext_add_indirect_multi(struct xfs_ifork *, int,
xfs_extnum_t, int);
void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
int, int);
-void xfs_iext_remove_inline(struct xfs_ifork *, xfs_extnum_t, int);
void xfs_iext_remove_direct(struct xfs_ifork *, xfs_extnum_t, int);
void xfs_iext_remove_indirect(struct xfs_ifork *, xfs_extnum_t, int);
void xfs_iext_realloc_direct(struct xfs_ifork *, int);
-void xfs_iext_direct_to_inline(struct xfs_ifork *, xfs_extnum_t);
-void xfs_iext_inline_to_direct(struct xfs_ifork *, int);
void xfs_iext_destroy(struct xfs_ifork *);
struct xfs_bmbt_rec_host *
xfs_iext_bno_to_ext(struct xfs_ifork *, xfs_fileoff_t, int *);
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index b6b954d5cf54..c2f8e40a3e1f 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1709,7 +1709,6 @@ xfs_swap_extent_forks(
xfs_filblks_t aforkblks = 0;
xfs_filblks_t taforkblks = 0;
xfs_extnum_t junk;
- xfs_extnum_t nextents;
uint64_t tmp;
int error;
@@ -1784,13 +1783,6 @@ xfs_swap_extent_forks(
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_EXTENTS:
- /*
- * If the extents fit in the inode, fix the pointer. Otherwise
- * it's already NULL or pointing to the extent.
- */
- nextents = xfs_iext_count(&ip->i_df);
- if (nextents <= XFS_INLINE_EXTS)
- ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
(*src_log_flags) |= XFS_ILOG_DEXT;
break;
case XFS_DINODE_FMT_BTREE:
@@ -1802,13 +1794,6 @@ xfs_swap_extent_forks(
switch (tip->i_d.di_format) {
case XFS_DINODE_FMT_EXTENTS:
- /*
- * If the extents fit in the inode, fix the pointer. Otherwise
- * it's already NULL or pointing to the extent.
- */
- nextents = xfs_iext_count(&tip->i_df);
- if (nextents <= XFS_INLINE_EXTS)
- tifp->if_u1.if_extents = tifp->if_u2.if_inline_ext;
(*target_log_flags) |= XFS_ILOG_DEXT;
break;
case XFS_DINODE_FMT_BTREE:
--
2.14.2
--
To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
