#include <unistd.h>
#include <errno.h>
#include <limits.h>
+#include <assert.h>
#include <sys/xattr.h>
#include <sys/param.h>
struct lu_extent llc_extent; /* [start, end) of component */
uint32_t llc_id; /* unique ID of component */
uint32_t llc_flags; /* LCME_FL_* flags */
+ uint64_t llc_timestamp; /* snapshot timestamp */
struct list_head llc_list; /* linked to the llapi_layout
components list */
};
ent = &comp_v1->lcm_entries[i];
__swab32s(&ent->lcme_id);
__swab32s(&ent->lcme_flags);
+ __swab64s(&ent->lcme_timestamp);
__swab64s(&ent->lcme_extent.e_start);
__swab64s(&ent->lcme_extent.e_end);
__swab32s(&ent->lcme_offset);
}
/**
+ * Check if the given \a lum_size is large enough to hold the required
+ * fields in \a lum.
+ *
+ * \param[in] lum the struct lov_user_md to check
+ * \param[in] lum_size the number of bytes in \a lum
+ *
+ * \retval true the \a lum_size is too small
+ * \retval false the \a lum_size is large enough
+ */
+static bool llapi_layout_lum_truncated(struct lov_user_md *lum, size_t lum_size)
+{
+ uint32_t magic;
+
+ if (lum_size < sizeof(lum->lmm_magic))
+ return true;
+
+ if (lum->lmm_magic == LOV_MAGIC_V1 ||
+ lum->lmm_magic == __swab32(LOV_MAGIC_V1))
+ magic = LOV_MAGIC_V1;
+ else if (lum->lmm_magic == LOV_MAGIC_V3 ||
+ lum->lmm_magic == __swab32(LOV_MAGIC_V3))
+ magic = LOV_MAGIC_V3;
+ else if (lum->lmm_magic == LOV_MAGIC_COMP_V1 ||
+ lum->lmm_magic == __swab32(LOV_MAGIC_COMP_V1))
+ magic = LOV_MAGIC_COMP_V1;
+ else
+ return true;
+
+ if (magic == LOV_MAGIC_V1 || magic == LOV_MAGIC_V3)
+ return lum_size < lov_user_md_size(0, magic);
+ else
+ return lum_size < sizeof(struct lov_comp_md_v1);
+}
+
+/* Verify if the objects count in lum is consistent with the
+ * stripe count in lum. It applies to regular file only. */
+static bool llapi_layout_lum_valid(struct lov_user_md *lum, int lum_size)
+{
+ struct lov_comp_md_v1 *comp_v1 = NULL;
+ int i, ent_count, obj_count;
+
+ if (lum->lmm_magic == LOV_MAGIC_COMP_V1) {
+ comp_v1 = (struct lov_comp_md_v1 *)lum;
+ ent_count = comp_v1->lcm_entry_count;
+ } else if (lum->lmm_magic == LOV_MAGIC_V1 ||
+ lum->lmm_magic == LOV_MAGIC_V3) {
+ ent_count = 1;
+ } else {
+ return false;
+ }
+
+ for (i = 0; i < ent_count; i++) {
+ if (comp_v1) {
+ lum = (struct lov_user_md *)((char *)comp_v1 +
+ comp_v1->lcm_entries[i].lcme_offset);
+ lum_size = comp_v1->lcm_entries[i].lcme_size;
+ }
+ obj_count = llapi_layout_objects_in_lum(lum, lum_size);
+
+ if (comp_v1) {
+ if (!(comp_v1->lcm_entries[i].lcme_flags &
+ LCME_FL_INIT) && obj_count != 0)
+ return false;
+ } else if (obj_count != lum->lmm_stripe_count) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/**
* Convert the data from a lov_user_md to a newly allocated llapi_layout.
* The caller is responsible for freeing the returned pointer.
*
- * \param[in] lum LOV user metadata structure to copy data from
- * \param[in] lum_size size the the lum passed in
+ * \param[in] lov_xattr LOV user metadata xattr to copy data from
+ * \param[in] lov_xattr_size size the lov_xattr_size passed in
+ * \param[in] flags bitwise-or'd flags to control the behavior
*
* \retval valid llapi_layout pointer on success
* \retval NULL if memory allocation fails
*/
-static struct llapi_layout *
-llapi_layout_from_lum(const struct lov_user_md *lum, int lum_size)
+struct llapi_layout *llapi_layout_get_by_xattr(void *lov_xattr,
+ ssize_t lov_xattr_size,
+ uint32_t flags)
{
+ struct lov_user_md *lum = lov_xattr;
struct lov_comp_md_v1 *comp_v1 = NULL;
struct lov_comp_md_entry_v1 *ent;
struct lov_user_md *v1;
- struct llapi_layout *layout;
+ struct llapi_layout *layout = NULL;
struct llapi_layout_comp *comp;
int i, ent_count = 0, obj_count;
- layout = __llapi_layout_alloc();
- if (layout == NULL)
+ if (lov_xattr == NULL || lov_xattr_size <= 0) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ /* Return an error if we got back a partial layout. */
+ if (llapi_layout_lum_truncated(lov_xattr, lov_xattr_size)) {
+ errno = ERANGE;
return NULL;
+ }
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+ if (flags & LLAPI_LXF_COPY) {
+ lum = malloc(lov_xattr_size);
+ if (lum == NULL) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ memcpy(lum, lov_xattr, lov_xattr_size);
+ }
+#endif
+
+ llapi_layout_swab_lov_user_md(lum, lov_xattr_size);
+
+ if ((flags & LLAPI_LXF_CHECK) &&
+ !llapi_layout_lum_valid(lum, lov_xattr_size)) {
+ errno = EBADSLT;
+ goto out;
+ }
+
+ layout = __llapi_layout_alloc();
+ if (layout == NULL) {
+ errno = ENOMEM;
+ goto out;
+ }
if (lum->lmm_magic == LOV_MAGIC_COMP_V1) {
comp_v1 = (struct lov_comp_md_v1 *)lum;
lum->lmm_magic == LOV_MAGIC_V3) {
ent_count = 1;
layout->llot_is_composite = false;
+
+ if (lov_xattr_size <= 0) {
+ errno = EINVAL;
+ goto out_layout;
+ }
+ } else {
+ errno = EOPNOTSUPP;
+ goto out_layout;
}
if (ent_count == 0) {
errno = EINVAL;
- goto error;
+ goto out_layout;
}
v1 = (struct lov_user_md *)lum;
ent = &comp_v1->lcm_entries[i];
v1 = (struct lov_user_md *)((char *)comp_v1 +
ent->lcme_offset);
- lum_size = ent->lcme_size;
+ lov_xattr_size = ent->lcme_size;
} else {
ent = NULL;
}
- obj_count = llapi_layout_objects_in_lum(v1, lum_size);
+ obj_count = llapi_layout_objects_in_lum(v1, lov_xattr_size);
comp = __llapi_comp_alloc(obj_count);
if (comp == NULL)
- goto error;
+ goto out_layout;
if (ent != NULL) {
comp->llc_extent.e_start = ent->lcme_extent.e_start;
comp->llc_extent.e_end = ent->lcme_extent.e_end;
comp->llc_id = ent->lcme_id;
comp->llc_flags = ent->lcme_flags;
+ if (comp->llc_flags & LCME_FL_NOSYNC)
+ comp->llc_timestamp = ent->lcme_timestamp;
} else {
comp->llc_extent.e_start = 0;
comp->llc_extent.e_end = LUSTRE_EOF;
if (v1->lmm_pattern == LOV_PATTERN_RAID0)
comp->llc_pattern = LLAPI_LAYOUT_RAID0;
+ else if (v1->lmm_pattern == (LOV_PATTERN_RAID0 |
+ LOV_PATTERN_OVERSTRIPING))
+ comp->llc_pattern = LLAPI_LAYOUT_OVERSTRIPING;
else
/* Lustre only supports RAID0 for now. */
comp->llc_pattern = v1->lmm_pattern;
layout->llot_cur_comp = comp;
}
+out:
+ if (lum != lov_xattr)
+ free(lum);
return layout;
-error:
+out_layout:
llapi_layout_free(layout);
- return NULL;
+ layout = NULL;
+ goto out;
+}
+
+__u32 llapi_pattern_to_lov(uint64_t pattern)
+{
+ __u32 lov_pattern;
+
+ switch (pattern) {
+ case LLAPI_LAYOUT_DEFAULT:
+ lov_pattern = LOV_PATTERN_RAID0;
+ break;
+ case LLAPI_LAYOUT_RAID0:
+ lov_pattern = LOV_PATTERN_RAID0;
+ break;
+ case LLAPI_LAYOUT_MDT:
+ lov_pattern = LOV_PATTERN_MDT;
+ break;
+ case LLAPI_LAYOUT_OVERSTRIPING:
+ lov_pattern = LOV_PATTERN_OVERSTRIPING | LOV_PATTERN_RAID0;
+ break;
+ default:
+ lov_pattern = EINVAL;
+ }
+
+ return lov_pattern;
}
/**
}
blob->lmm_magic = magic;
- if (pattern == LLAPI_LAYOUT_DEFAULT)
- blob->lmm_pattern = LOV_PATTERN_RAID0;
- else if (pattern == LLAPI_LAYOUT_MDT)
- blob->lmm_pattern = LOV_PATTERN_MDT;
- else
- blob->lmm_pattern = pattern;
+ blob->lmm_pattern = llapi_pattern_to_lov(pattern);
+ if (blob->lmm_pattern == EINVAL) {
+ errno = EINVAL;
+ goto error;
+ }
if (comp->llc_stripe_size == LLAPI_LAYOUT_DEFAULT)
blob->lmm_stripe_size = 0;
ent = &comp_v1->lcm_entries[ent_idx];
ent->lcme_id = comp->llc_id;
ent->lcme_flags = comp->llc_flags;
+ if (ent->lcme_flags & LCME_FL_NOSYNC)
+ ent->lcme_timestamp = comp->llc_timestamp;
ent->lcme_extent.e_start = comp->llc_extent.e_start;
ent->lcme_extent.e_end = comp->llc_extent.e_end;
ent->lcme_size = blob_size;
{
char *p;
- strncpy(buf, path, size);
+ strncpy(buf, path, size - 1);
p = strrchr(buf, '/');
if (p != NULL) {
}
/**
- * Check if the given \a lum_size is large enough to hold the required
- * fields in \a lum.
- *
- * \param[in] lum the struct lov_user_md to check
- * \param[in] lum_size the number of bytes in \a lum
- *
- * \retval true the \a lum_size is too small
- * \retval false the \a lum_size is large enough
- */
-static bool llapi_layout_lum_truncated(struct lov_user_md *lum, size_t lum_size)
-{
- uint32_t magic;
-
- if (lum_size < sizeof(lum->lmm_magic))
- return true;
-
- if (lum->lmm_magic == LOV_MAGIC_V1 ||
- lum->lmm_magic == __swab32(LOV_MAGIC_V1))
- magic = LOV_MAGIC_V1;
- else if (lum->lmm_magic == LOV_MAGIC_V3 ||
- lum->lmm_magic == __swab32(LOV_MAGIC_V3))
- magic = LOV_MAGIC_V3;
- else if (lum->lmm_magic == LOV_MAGIC_COMP_V1 ||
- lum->lmm_magic == __swab32(LOV_MAGIC_COMP_V1))
- magic = LOV_MAGIC_COMP_V1;
- else
- return true;
-
- if (magic == LOV_MAGIC_V1 || magic == LOV_MAGIC_V3)
- return lum_size < lov_user_md_size(0, magic);
- else
- return lum_size < sizeof(struct lov_comp_md_v1);
-}
-
-/* Verify if the objects count in lum is consistent with the
- * stripe count in lum. It applies to regular file only. */
-static bool llapi_layout_lum_valid(struct lov_user_md *lum, int lum_size)
-{
- struct lov_comp_md_v1 *comp_v1 = NULL;
- int i, ent_count, obj_count;
-
- if (lum->lmm_magic == LOV_MAGIC_COMP_V1) {
- comp_v1 = (struct lov_comp_md_v1 *)lum;
- ent_count = comp_v1->lcm_entry_count;
- } else if (lum->lmm_magic == LOV_MAGIC_V1 ||
- lum->lmm_magic == LOV_MAGIC_V3) {
- ent_count = 1;
- } else {
- return false;
- }
-
- for (i = 0; i < ent_count; i++) {
- if (comp_v1) {
- lum = (struct lov_user_md *)((char *)comp_v1 +
- comp_v1->lcm_entries[i].lcme_offset);
- lum_size = comp_v1->lcm_entries[i].lcme_size;
- }
- obj_count = llapi_layout_objects_in_lum(lum, lum_size);
-
- if (comp_v1) {
- if (!(comp_v1->lcm_entries[i].lcme_flags &
- LCME_FL_INIT) && obj_count != 0)
- return false;
- } else if (obj_count != lum->lmm_stripe_count) {
- return false;
- }
- }
- return true;
-}
-
-/**
* Get the striping layout for the file referenced by file descriptor \a fd.
*
* If the filesystem does not support the "lustre." xattr namespace, the
goto out;
}
- /* Return an error if we got back a partial layout. */
- if (llapi_layout_lum_truncated(lum, bytes_read)) {
- errno = EINTR;
- goto out;
- }
-
- llapi_layout_swab_lov_user_md(lum, bytes_read);
-
/* Directories may have a positive non-zero lum->lmm_stripe_count
* yet have an empty lum->lmm_objects array. For non-directories the
* amount of data returned from the kernel must be consistent
if (fstat(fd, &st) < 0)
goto out;
- if (!S_ISDIR(st.st_mode) && !llapi_layout_lum_valid(lum, bytes_read)) {
- errno = EINTR;
- goto out;
- }
-
- layout = llapi_layout_from_lum(lum, bytes_read);
+ layout = llapi_layout_get_by_xattr(lum, bytes_read,
+ S_ISDIR(st.st_mode) ? 0 : LLAPI_LXF_CHECK);
out:
free(lum);
return layout;
llapi_stripe_count_is_valid(stripe_count));
}
+static bool llapi_layout_extension_size_is_valid(uint64_t ext_size)
+{
+ return (ext_size != 0 &&
+ llapi_stripe_size_is_aligned(ext_size) &&
+ !llapi_stripe_size_is_too_big(ext_size));
+}
+
static bool llapi_layout_stripe_size_is_valid(uint64_t stripe_size)
{
return stripe_size == LLAPI_LAYOUT_DEFAULT ||
}
/**
- * Get the stripe size of \a layout.
+ * Get the stripe/extension size of \a layout.
*
* \param[in] layout layout to get stripe size from
* \param[out] size integer to store stripe size in
+ * \param[in] extension flag if extenion size is requested
*
* \retval 0 on success
* \retval -1 if arguments are invalid
*/
-int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
- uint64_t *size)
+static int layout_stripe_size_get(const struct llapi_layout *layout,
+ uint64_t *size, bool extension)
{
struct llapi_layout_comp *comp;
+ int comp_ext;
comp = __llapi_layout_cur_comp(layout);
if (comp == NULL)
return -1;
}
+ comp_ext = comp->llc_flags & LCME_FL_EXTENSION;
+ if ((comp_ext && !extension) || (!comp_ext && extension)) {
+ errno = EINVAL;
+ return -1;
+ }
+
*size = comp->llc_stripe_size;
+ if (comp->llc_flags & LCME_FL_EXTENSION)
+ *size *= SEL_UNIT_SIZE;
return 0;
}
+int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
+ uint64_t *size)
+{
+ return layout_stripe_size_get(layout, size, false);
+}
+
+int llapi_layout_extension_size_get(const struct llapi_layout *layout,
+ uint64_t *size)
+{
+ return layout_stripe_size_get(layout, size, true);
+}
+
/**
- * Set the stripe size of \a layout.
+ * Set the stripe/extension size of \a layout.
*
* \param[in] layout layout to set stripe size in
* \param[in] size value to be set
+ * \param[in] extension flag if extenion size is passed
*
* \retval 0 on success
* \retval -1 if arguments are invalid
*/
-int llapi_layout_stripe_size_set(struct llapi_layout *layout,
- uint64_t size)
+static int layout_stripe_size_set(struct llapi_layout *layout,
+ uint64_t size, bool extension)
{
struct llapi_layout_comp *comp;
+ int comp_ext;
comp = __llapi_layout_cur_comp(layout);
if (comp == NULL)
return -1;
- if (!llapi_layout_stripe_size_is_valid(size)) {
+ comp_ext = comp->llc_flags & LCME_FL_EXTENSION;
+ if ((comp_ext && !extension) || (!comp_ext && extension)) {
errno = EINVAL;
return -1;
}
- comp->llc_stripe_size = size;
+ if (comp_ext)
+ size /= SEL_UNIT_SIZE;
+
+ if ((comp_ext && !llapi_layout_extension_size_is_valid(size)) ||
+ (!comp_ext && !llapi_layout_stripe_size_is_valid(size))) {
+ errno = EINVAL;
+ return -1;
+ }
+ comp->llc_stripe_size = size;
return 0;
}
+int llapi_layout_stripe_size_set(struct llapi_layout *layout,
+ uint64_t size)
+{
+ return layout_stripe_size_set(layout, size, false);
+}
+
+int llapi_layout_extension_size_set(struct llapi_layout *layout,
+ uint64_t size)
+{
+ return layout_stripe_size_set(layout, size, true);
+}
+
/**
* Get the RAID pattern of \a layout.
*
return -1;
if (pattern != LLAPI_LAYOUT_DEFAULT &&
- pattern != LLAPI_LAYOUT_RAID0 && pattern != LLAPI_LAYOUT_MDT) {
+ pattern != LLAPI_LAYOUT_RAID0 && pattern != LLAPI_LAYOUT_MDT
+ && pattern != LLAPI_LAYOUT_OVERSTRIPING) {
errno = EOPNOTSUPP;
return -1;
}
*
* \param[in] path name of the file to open
* \param[in] open_flags open() flags
- * \param[in] mode permissions to create new file with
+ * \param[in] mode permissions to create file, filtered by umask
* \param[in] layout layout to create new file with
*
* \retval non-negative file descriptor on successful open
return 0;
}
+const char *llapi_layout_flags_string(uint32_t flags)
+{
+ switch (flags & LCM_FL_FLR_MASK) {
+ case LCM_FL_RDONLY:
+ return "ro";
+ case LCM_FL_WRITE_PENDING:
+ return "wp";
+ case LCM_FL_SYNC_PENDING:
+ return "sp";
+ }
+
+ return "0";
+}
+
+const __u16 llapi_layout_string_flags(char *string)
+{
+ if (strncmp(string, "ro", strlen(string)) == 0)
+ return LCM_FL_RDONLY;
+ if (strncmp(string, "wp", strlen(string)) == 0)
+ return LCM_FL_WRITE_PENDING;
+ if (strncmp(string, "sp", strlen(string)) == 0)
+ return LCM_FL_SYNC_PENDING;
+
+ return 0;
+}
+
/**
* llapi_layout_mirror_count_is_valid() - Check the validity of mirror count.
* @count: Mirror count value to be checked.
if (comp == NULL)
return -1;
- if (start >= end) {
+ if (start > end) {
errno = EINVAL;
return -1;
}
if (comp->llc_list.prev != &layout->llot_comp_list) {
prev = list_entry(comp->llc_list.prev, typeof(*prev),
llc_list);
- if (start != prev->llc_extent.e_end) {
+ if (start != 0 && start != prev->llc_extent.e_end) {
errno = EINVAL;
return -1;
}
if (comp->llc_list.next != &layout->llot_comp_list) {
next = list_entry(comp->llc_list.next, typeof(*next),
llc_list);
- if (end != next->llc_extent.e_start) {
+ if (next->llc_extent.e_start != 0 &&
+ end != next->llc_extent.e_start) {
errno = EINVAL;
return -1;
}
return 0;
}
+/**
+ * Adds a first component of a mirror to \a layout.
+ * The \a layout will change it's current component pointer to
+ * the newly added component, and it'll be turned into a composite
+ * layout if it was not before the adding.
+ *
+ * \param[in] layout existing composite or plain layout
+ *
+ * \retval 0 on success
+ * \retval <0 if error occurs
+ */
+int llapi_layout_add_first_comp(struct llapi_layout *layout)
+{
+ struct llapi_layout_comp *comp, *new;
+
+ comp = __llapi_layout_cur_comp(layout);
+ if (comp == NULL)
+ return -1;
+
+ new = __llapi_comp_alloc(0);
+ if (new == NULL)
+ return -1;
+
+ new->llc_extent.e_start = 0;
+
+ list_add_tail(&new->llc_list, &layout->llot_comp_list);
+ layout->llot_cur_comp = new;
+ layout->llot_is_composite = true;
+
+ return 0;
+}
/**
* Deletes current component from the composite layout. The component
/**
* Iterate every components in the @layout and call callback function @cb.
*
- * \param[in]
+ * \param[in] layout component layout list.
+ * \param[in] cb callback for each component
+ * \param[in] cbdata callback data
+ *
+ * \retval < 0 error happens during the iteration
+ * \retval LLAPI_LAYOUT_ITER_CONT finished the iteration w/o error
+ * \retval LLAPI_LAYOUT_ITER_STOP got something, stop the iteration
*/
int llapi_layout_comp_iterate(struct llapi_layout *layout,
llapi_layout_iter_cb cb, void *cbdata)
if (rc < 0)
return rc;
- while (rc == 0) {
+ /**
+ * make sure on success llapi_layout_comp_use() API returns 0 with
+ * USE_FIRST.
+ */
+ assert(rc == 0);
+
+ while (1) {
rc = cb(layout, cbdata);
if (rc != LLAPI_LAYOUT_ITER_CONT)
break;
rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_NEXT);
if (rc < 0)
return rc;
+ else if (rc == 1) /* reached the last comp */
+ return LLAPI_LAYOUT_ITER_CONT;
}
- return rc >= 0 ? LLAPI_LAYOUT_ITER_CONT : rc;
+ return rc;
}
/**
/* not in the specified mirror */
if (j == ids_nr)
goto next;
+ } else if (flags & LCME_FL_NOSYNC) {
+ /* if not specified mirrors, do not resync "nosync"
+ * mirrors */
+ goto next;
}
rc = llapi_layout_comp_id_get(layout, &id);
}
/* locate @layout to a valid component covering file [file_start, file_end) */
-static uint32_t llapi_mirror_find(struct llapi_layout *layout,
- uint64_t file_start, uint64_t file_end,
- uint64_t *endp)
+uint32_t llapi_mirror_find(struct llapi_layout *layout,
+ uint64_t file_start, uint64_t file_end,
+ uint64_t *endp)
{
uint32_t mirror_id = 0;
int rc;
return mirror_id;
}
-ssize_t llapi_mirror_resync_one(int fd, struct llapi_layout *layout,
- uint32_t dst, uint64_t start, uint64_t end)
+int llapi_mirror_resync_many(int fd, struct llapi_layout *layout,
+ struct llapi_resync_comp *comp_array,
+ int comp_size, uint64_t start, uint64_t end)
{
- uint64_t mirror_end = 0;
- ssize_t result = 0;
- size_t count;
+ uint64_t count;
+ size_t page_size = sysconf(_SC_PAGESIZE);
+ const size_t buflen = 4 << 20; /* 4M */
+ void *buf;
+ uint64_t pos = start;
+ int i;
+ int rc;
+
+ rc = posix_memalign(&buf, page_size, buflen);
+ if (rc)
+ return -rc;
if (end == OBD_OBJECT_EOF)
count = OBD_OBJECT_EOF;
while (count > 0) {
uint32_t src;
- size_t to_copy;
- ssize_t copied;
+ uint64_t mirror_end = 0;
+ uint64_t bytes_left;
+ ssize_t bytes_read;
+ size_t to_read;
+ size_t to_write;
- src = llapi_mirror_find(layout, start, end, &mirror_end);
+ src = llapi_mirror_find(layout, pos, end, &mirror_end);
if (src == 0)
return -ENOENT;
- if (mirror_end == OBD_OBJECT_EOF)
- to_copy = count;
- else
- to_copy = MIN(count, mirror_end - start);
-
- copied = llapi_mirror_copy(fd, src, dst, start, to_copy);
- if (copied < 0)
- return copied;
+ if (mirror_end == OBD_OBJECT_EOF) {
+ bytes_left = count;
+ } else {
+ bytes_left = MIN(count, mirror_end - pos);
+ bytes_left = ((bytes_left - 1) | (page_size - 1)) + 1;
+ }
+ to_read = MIN(buflen, bytes_left);
- result += copied;
- if (copied < to_copy) /* end of file */
+ bytes_read = llapi_mirror_read(fd, src, buf, to_read, pos);
+ if (bytes_read == 0) {
+ /* end of file */
+ break;
+ }
+ if (bytes_read < 0) {
+ rc = bytes_read;
break;
+ }
+
+ /* round up to page align to make direct IO happy. */
+ to_write = ((bytes_read - 1) | (page_size - 1)) + 1;
+
+ for (i = 0; i < comp_size; i++) {
+ ssize_t written;
+ off_t pos2 = pos;
+ size_t to_write2 = to_write;
+
+ /* skip non-overlapped component */
+ if (pos >= comp_array[i].lrc_end ||
+ pos + to_write <= comp_array[i].lrc_start)
+ continue;
+
+ if (pos < comp_array[i].lrc_start)
+ pos2 = comp_array[i].lrc_start;
+
+ to_write2 -= pos2 - pos;
+
+ if ((pos + to_write) > comp_array[i].lrc_end)
+ to_write2 -= pos + to_write -
+ comp_array[i].lrc_end;
+
+ written = llapi_mirror_write(fd,
+ comp_array[i].lrc_mirror_id,
+ buf + pos2 - pos,
+ to_write2, pos2);
+ if (written < 0) {
+ /**
+ * this component is not written successfully,
+ * mark it using its lrc_synced, it is supposed
+ * to be false before getting here.
+ *
+ * And before this function returns, all
+ * elements of comp_array will reverse their
+ * lrc_synced flag to reflect their true
+ * meanings.
+ */
+ comp_array[i].lrc_synced = true;
+ continue;
+ }
+ assert(written == to_write2);
+ }
- if (count != OBD_OBJECT_EOF)
- count -= copied;
- start += copied;
+ pos += bytes_read;
+ count -= bytes_read;
}
- return result;
+ free(buf);
+
+ if (rc < 0) {
+ for (i = 0; i < comp_size; i++)
+ comp_array[i].lrc_synced = false;
+ return rc;
+ }
+
+ for (i = 0; i < comp_size; i++) {
+ comp_array[i].lrc_synced = !comp_array[i].lrc_synced;
+ if (comp_array[i].lrc_synced && pos & (page_size - 1)) {
+ rc = llapi_mirror_truncate(fd,
+ comp_array[i].lrc_mirror_id, pos);
+ if (rc < 0)
+ comp_array[i].lrc_synced = false;
+ }
+ }
+
+ /* partially successful is successful */
+ return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff