ext4: add ext4_sb_bread() to disambiguate ENOMEM cases
Today, when sb_bread() returns NULL, this can either be because of an I/O error or because the system failed to allocate the buffer. Since it's an old interface, changing would require changing many call sites. So instead we create our own ext4_sb_bread(), which also allows us to set the REQ_META flag. Also fixed a problem in the xattr code where a NULL return in a function could also mean that the xattr was not found, which could lead to the wrong error getting returned to userspace. Fixes: ac27a0ec ("ext4: initial copy of files from ext3") Cc: stable@kernel.org # 2.6.19 Signed-off-by:Theodore Ts'o <tytso@mit.edu>
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